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Finding the Fourth Proportional to 124.72, 171.66 and 108.85

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Solution

The fourth proportional to 124.72, 171.66 and 108.85 is: 149.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.72 : 171.66 = 108.85 : x
  2. Step 2: Convert to fraction form
    124.72/171.66 = 108.85/x
  3. Step 3: Cross multiply
    124.72x = 171.66 × 108.85
  4. Step 4: Simplify right side
    124.72x = 18,685.19
  5. Step 5: Solve for x
    x = 18,685.19/124.72
  6. Step 6: Final answer
    x = 149.82

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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.