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Finding the Fourth Proportional to 125.54, 173.16 and 81.87

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Solution

The fourth proportional to 125.54, 173.16 and 81.87 is: 112.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.54 : 173.16 = 81.87 : x
  2. Step 2: Convert to fraction form
    125.54/173.16 = 81.87/x
  3. Step 3: Cross multiply
    125.54x = 173.16 × 81.87
  4. Step 4: Simplify right side
    125.54x = 14,176.61
  5. Step 5: Solve for x
    x = 14,176.61/125.54
  6. Step 6: Final answer
    x = 112.93

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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.