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Finding the Fourth Proportional to 485,612.70, 728,419.05 and 408,630.30

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Solution

The fourth proportional to 485,612.70, 728,419.05 and 408,630.30 is: 612,945.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,612.70 : 728,419.05 = 408,630.30 : x
  2. Step 2: Convert to fraction form
    485,612.70/728,419.05 = 408,630.30/x
  3. Step 3: Cross multiply
    485,612.70x = 728,419.05 × 408,630.30
  4. Step 4: Simplify right side
    485,612.70x = 297,654,094,927.22
  5. Step 5: Solve for x
    x = 297,654,094,927.22/485,612.70
  6. Step 6: Final answer
    x = 612,945.45

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Double scale
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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.