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Finding the Fourth Proportional to 486,008.80, 728,138.40 and 396,779.20

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Solution

The fourth proportional to 486,008.80, 728,138.40 and 396,779.20 is: 594,454.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,008.80 : 728,138.40 = 396,779.20 : x
  2. Step 2: Convert to fraction form
    486,008.80/728,138.40 = 396,779.20/x
  3. Step 3: Cross multiply
    486,008.80x = 728,138.40 × 396,779.20
  4. Step 4: Simplify right side
    486,008.80x = 288,910,171,841.28
  5. Step 5: Solve for x
    x = 288,910,171,841.28/486,008.80
  6. Step 6: Final answer
    x = 594,454.61

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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.