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Finding the Fourth Proportional to 485,613.20, 728,419.80 and 408,630.80

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Solution

The fourth proportional to 485,613.20, 728,419.80 and 408,630.80 is: 612,946.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,613.20 : 728,419.80 = 408,630.80 : x
  2. Step 2: Convert to fraction form
    485,613.20/728,419.80 = 408,630.80/x
  3. Step 3: Cross multiply
    485,613.20x = 728,419.80 × 408,630.80
  4. Step 4: Simplify right side
    485,613.20x = 297,654,765,609.84
  5. Step 5: Solve for x
    x = 297,654,765,609.84/485,613.20
  6. Step 6: Final answer
    x = 612,946.20

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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.