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Finding the Fourth Proportional to 91.74, 136.89 and 86.04

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Solution

The fourth proportional to 91.74, 136.89 and 86.04 is: 128.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.74 : 136.89 = 86.04 : x
  2. Step 2: Convert to fraction form
    91.74/136.89 = 86.04/x
  3. Step 3: Cross multiply
    91.74x = 136.89 × 86.04
  4. Step 4: Simplify right side
    91.74x = 11,778.02
  5. Step 5: Solve for x
    x = 11,778.02/91.74
  6. Step 6: Final answer
    x = 128.38

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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.