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Finding the Fourth Proportional to 91.56, 136.59 and 83.70

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Solution

The fourth proportional to 91.56, 136.59 and 83.70 is: 124.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.56 : 136.59 = 83.70 : x
  2. Step 2: Convert to fraction form
    91.56/136.59 = 83.70/x
  3. Step 3: Cross multiply
    91.56x = 136.59 × 83.70
  4. Step 4: Simplify right side
    91.56x = 11,432.58
  5. Step 5: Solve for x
    x = 11,432.58/91.56
  6. Step 6: Final answer
    x = 124.86

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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.