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Finding the Fourth Proportional to 124.65, 186.71 and 81.17

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Solution

The fourth proportional to 124.65, 186.71 and 81.17 is: 121.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.65 : 186.71 = 81.17 : x
  2. Step 2: Convert to fraction form
    124.65/186.71 = 81.17/x
  3. Step 3: Cross multiply
    124.65x = 186.71 × 81.17
  4. Step 4: Simplify right side
    124.65x = 15,154.38
  5. Step 5: Solve for x
    x = 15,154.38/124.65
  6. Step 6: Final answer
    x = 121.57

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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.