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Finding the Fourth Proportional to 124.57, 171.84 and 87.71

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Solution

The fourth proportional to 124.57, 171.84 and 87.71 is: 120.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.57 : 171.84 = 87.71 : x
  2. Step 2: Convert to fraction form
    124.57/171.84 = 87.71/x
  3. Step 3: Cross multiply
    124.57x = 171.84 × 87.71
  4. Step 4: Simplify right side
    124.57x = 15,072.09
  5. Step 5: Solve for x
    x = 15,072.09/124.57
  6. Step 6: Final answer
    x = 120.99

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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.