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Finding the Fourth Proportional to 125.16, 187.91 and 99.72

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Solution

The fourth proportional to 125.16, 187.91 and 99.72 is: 149.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.16 : 187.91 = 99.72 : x
  2. Step 2: Convert to fraction form
    125.16/187.91 = 99.72/x
  3. Step 3: Cross multiply
    125.16x = 187.91 × 99.72
  4. Step 4: Simplify right side
    125.16x = 18,737.89
  5. Step 5: Solve for x
    x = 18,737.89/125.16
  6. Step 6: Final answer
    x = 149.71

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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.