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Finding the Fourth Proportional to 91.62, 136.68 and 76.50

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Solution

The fourth proportional to 91.62, 136.68 and 76.50 is: 114.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.62 : 136.68 = 76.50 : x
  2. Step 2: Convert to fraction form
    91.62/136.68 = 76.50/x
  3. Step 3: Cross multiply
    91.62x = 136.68 × 76.50
  4. Step 4: Simplify right side
    91.62x = 10,456.02
  5. Step 5: Solve for x
    x = 10,456.02/91.62
  6. Step 6: Final answer
    x = 114.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.