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Finding the Fourth Proportional to 578,612.20, 867,918.30 and 485,300.20

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Solution

The fourth proportional to 578,612.20, 867,918.30 and 485,300.20 is: 727,950.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,612.20 : 867,918.30 = 485,300.20 : x
  2. Step 2: Convert to fraction form
    578,612.20/867,918.30 = 485,300.20/x
  3. Step 3: Cross multiply
    578,612.20x = 867,918.30 × 485,300.20
  4. Step 4: Simplify right side
    578,612.20x = 421,200,924,573.66
  5. Step 5: Solve for x
    x = 421,200,924,573.66/578,612.20
  6. Step 6: Final answer
    x = 727,950.30

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Half scale
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Double scale
Find fourth proportional to 578,613.20, 867,919.80 and 485,301.20
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.