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Finding the Fourth Proportional to 136.28, 187.91 and 123.17

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Solution

The fourth proportional to 136.28, 187.91 and 123.17 is: 169.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.28 : 187.91 = 123.17 : x
  2. Step 2: Convert to fraction form
    136.28/187.91 = 123.17/x
  3. Step 3: Cross multiply
    136.28x = 187.91 × 123.17
  4. Step 4: Simplify right side
    136.28x = 23,143.94
  5. Step 5: Solve for x
    x = 23,143.94/136.28
  6. Step 6: Final answer
    x = 169.83

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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.