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Finding the Fourth Proportional to 125.72, 187.72 and 108.61

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Solution

The fourth proportional to 125.72, 187.72 and 108.61 is: 162.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.72 : 187.72 = 108.61 : x
  2. Step 2: Convert to fraction form
    125.72/187.72 = 108.61/x
  3. Step 3: Cross multiply
    125.72x = 187.72 × 108.61
  4. Step 4: Simplify right side
    125.72x = 20,387.53
  5. Step 5: Solve for x
    x = 20,387.53/125.72
  6. Step 6: Final answer
    x = 162.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.