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Finding the Fourth Proportional to 136.23, 187.76 and 91.89

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Solution

The fourth proportional to 136.23, 187.76 and 91.89 is: 126.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.23 : 187.76 = 91.89 : x
  2. Step 2: Convert to fraction form
    136.23/187.76 = 91.89/x
  3. Step 3: Cross multiply
    136.23x = 187.76 × 91.89
  4. Step 4: Simplify right side
    136.23x = 17,253.27
  5. Step 5: Solve for x
    x = 17,253.27/136.23
  6. Step 6: Final answer
    x = 126.65

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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.