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Finding the Fourth Proportional to 72,387.74, 108,581.64 and 19,793.24

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Solution

The fourth proportional to 72,387.74, 108,581.64 and 19,793.24 is: 29,689.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,387.74 : 108,581.64 = 19,793.24 : x
  2. Step 2: Convert to fraction form
    72,387.74/108,581.64 = 19,793.24/x
  3. Step 3: Cross multiply
    72,387.74x = 108,581.64 × 19,793.24
  4. Step 4: Simplify right side
    72,387.74x = 2,149,182,460.11
  5. Step 5: Solve for x
    x = 2,149,182,460.11/72,387.74
  6. Step 6: Final answer
    x = 29,689.87

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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.