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Finding the Fourth Proportional to 91.48, 136.70 and 89.43

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Solution

The fourth proportional to 91.48, 136.70 and 89.43 is: 133.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.48 : 136.70 = 89.43 : x
  2. Step 2: Convert to fraction form
    91.48/136.70 = 89.43/x
  3. Step 3: Cross multiply
    91.48x = 136.70 × 89.43
  4. Step 4: Simplify right side
    91.48x = 12,224.97
  5. Step 5: Solve for x
    x = 12,224.97/91.48
  6. Step 6: Final answer
    x = 133.64

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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.