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Finding the Fourth Proportional to 485,998.20, 728,997.30 and 342,919.80

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Solution

The fourth proportional to 485,998.20, 728,997.30 and 342,919.80 is: 514,379.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,998.20 : 728,997.30 = 342,919.80 : x
  2. Step 2: Convert to fraction form
    485,998.20/728,997.30 = 342,919.80/x
  3. Step 3: Cross multiply
    485,998.20x = 728,997.30 × 342,919.80
  4. Step 4: Simplify right side
    485,998.20x = 249,987,608,316.54
  5. Step 5: Solve for x
    x = 249,987,608,316.54/485,998.20
  6. Step 6: Final answer
    x = 514,379.70

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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.