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Finding the Fourth Proportional to 515,029.20, 772,543.80 and 485,998.80

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Solution

The fourth proportional to 515,029.20, 772,543.80 and 485,998.80 is: 728,998.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,029.20 : 772,543.80 = 485,998.80 : x
  2. Step 2: Convert to fraction form
    515,029.20/772,543.80 = 485,998.80/x
  3. Step 3: Cross multiply
    515,029.20x = 772,543.80 × 485,998.80
  4. Step 4: Simplify right side
    515,029.20x = 375,455,359,747.44
  5. Step 5: Solve for x
    x = 375,455,359,747.44/515,029.20
  6. Step 6: Final answer
    x = 728,998.20

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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.