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Finding the Fourth Proportional to 91.79, 136.82 and 91.08

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Solution

The fourth proportional to 91.79, 136.82 and 91.08 is: 135.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.79 : 136.82 = 91.08 : x
  2. Step 2: Convert to fraction form
    91.79/136.82 = 91.08/x
  3. Step 3: Cross multiply
    91.79x = 136.82 × 91.08
  4. Step 4: Simplify right side
    91.79x = 12,461.11
  5. Step 5: Solve for x
    x = 12,461.11/91.79
  6. Step 6: Final answer
    x = 135.76

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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.