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Finding the Fourth Proportional to 92.71, 138.92 and 72.43

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Solution

The fourth proportional to 92.71, 138.92 and 72.43 is: 108.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.71 : 138.92 = 72.43 : x
  2. Step 2: Convert to fraction form
    92.71/138.92 = 72.43/x
  3. Step 3: Cross multiply
    92.71x = 138.92 × 72.43
  4. Step 4: Simplify right side
    92.71x = 10,061.27
  5. Step 5: Solve for x
    x = 10,061.27/92.71
  6. Step 6: Final answer
    x = 108.52

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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.