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Finding the Fourth Proportional to 91.18, 136.04 and 86.41

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Solution

The fourth proportional to 91.18, 136.04 and 86.41 is: 128.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.18 : 136.04 = 86.41 : x
  2. Step 2: Convert to fraction form
    91.18/136.04 = 86.41/x
  3. Step 3: Cross multiply
    91.18x = 136.04 × 86.41
  4. Step 4: Simplify right side
    91.18x = 11,755.22
  5. Step 5: Solve for x
    x = 11,755.22/91.18
  6. Step 6: Final answer
    x = 128.92

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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.