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Finding the Fourth Proportional to 91.39, 136.97 and 43.18

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Solution

The fourth proportional to 91.39, 136.97 and 43.18 is: 64.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.39 : 136.97 = 43.18 : x
  2. Step 2: Convert to fraction form
    91.39/136.97 = 43.18/x
  3. Step 3: Cross multiply
    91.39x = 136.97 × 43.18
  4. Step 4: Simplify right side
    91.39x = 5,914.15
  5. Step 5: Solve for x
    x = 5,914.15/91.39
  6. Step 6: Final answer
    x = 64.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.