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Finding the Fourth Proportional to 125.43, 173.02 and 81.13

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Solution

The fourth proportional to 125.43, 173.02 and 81.13 is: 111.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.43 : 173.02 = 81.13 : x
  2. Step 2: Convert to fraction form
    125.43/173.02 = 81.13/x
  3. Step 3: Cross multiply
    125.43x = 173.02 × 81.13
  4. Step 4: Simplify right side
    125.43x = 14,036.71
  5. Step 5: Solve for x
    x = 14,036.71/125.43
  6. Step 6: Final answer
    x = 111.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.