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Finding the Fourth Proportional to 136.13, 187.71 and 84.38

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Solution

The fourth proportional to 136.13, 187.71 and 84.38 is: 116.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.13 : 187.71 = 84.38 : x
  2. Step 2: Convert to fraction form
    136.13/187.71 = 84.38/x
  3. Step 3: Cross multiply
    136.13x = 187.71 × 84.38
  4. Step 4: Simplify right side
    136.13x = 15,838.97
  5. Step 5: Solve for x
    x = 15,838.97/136.13
  6. Step 6: Final answer
    x = 116.35

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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.