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Finding the Fourth Proportional to 125.52, 173.28 and 81.28

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Solution

The fourth proportional to 125.52, 173.28 and 81.28 is: 112.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.52 : 173.28 = 81.28 : x
  2. Step 2: Convert to fraction form
    125.52/173.28 = 81.28/x
  3. Step 3: Cross multiply
    125.52x = 173.28 × 81.28
  4. Step 4: Simplify right side
    125.52x = 14,084.20
  5. Step 5: Solve for x
    x = 14,084.20/125.52
  6. Step 6: Final answer
    x = 112.21

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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.