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Finding the Fourth Proportional to 72,487.92, 108,763.20 and 39,231.42

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Solution

The fourth proportional to 72,487.92, 108,763.20 and 39,231.42 is: 58,864.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,487.92 : 108,763.20 = 39,231.42 : x
  2. Step 2: Convert to fraction form
    72,487.92/108,763.20 = 39,231.42/x
  3. Step 3: Cross multiply
    72,487.92x = 108,763.20 × 39,231.42
  4. Step 4: Simplify right side
    72,487.92x = 4,266,934,779.74
  5. Step 5: Solve for x
    x = 4,266,934,779.74/72,487.92
  6. Step 6: Final answer
    x = 58,864.08

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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.