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Finding the Fourth Proportional to 485,615.40, 728,423.10 and 442,069.80

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Solution

The fourth proportional to 485,615.40, 728,423.10 and 442,069.80 is: 663,104.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,615.40 : 728,423.10 = 442,069.80 : x
  2. Step 2: Convert to fraction form
    485,615.40/728,423.10 = 442,069.80/x
  3. Step 3: Cross multiply
    485,615.40x = 728,423.10 × 442,069.80
  4. Step 4: Simplify right side
    485,615.40x = 322,013,854,132.38
  5. Step 5: Solve for x
    x = 322,013,854,132.38/485,615.40
  6. Step 6: Final answer
    x = 663,104.70

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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.