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Finding the Fourth Proportional to 91.38, 136.42 and 88.17

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Solution

The fourth proportional to 91.38, 136.42 and 88.17 is: 131.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.38 : 136.42 = 88.17 : x
  2. Step 2: Convert to fraction form
    91.38/136.42 = 88.17/x
  3. Step 3: Cross multiply
    91.38x = 136.42 × 88.17
  4. Step 4: Simplify right side
    91.38x = 12,028.51
  5. Step 5: Solve for x
    x = 12,028.51/91.38
  6. Step 6: Final answer
    x = 131.63

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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.