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Finding the Fourth Proportional to 91.78, 136.68 and 88.58

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Solution

The fourth proportional to 91.78, 136.68 and 88.58 is: 131.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.78 : 136.68 = 88.58 : x
  2. Step 2: Convert to fraction form
    91.78/136.68 = 88.58/x
  3. Step 3: Cross multiply
    91.78x = 136.68 × 88.58
  4. Step 4: Simplify right side
    91.78x = 12,107.11
  5. Step 5: Solve for x
    x = 12,107.11/91.78
  6. Step 6: Final answer
    x = 131.91

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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.