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Finding the Fourth Proportional to 91.15, 125.69 and 66.58

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Solution

The fourth proportional to 91.15, 125.69 and 66.58 is: 91.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.15 : 125.69 = 66.58 : x
  2. Step 2: Convert to fraction form
    91.15/125.69 = 66.58/x
  3. Step 3: Cross multiply
    91.15x = 125.69 × 66.58
  4. Step 4: Simplify right side
    91.15x = 8,367.79
  5. Step 5: Solve for x
    x = 8,367.79/91.15
  6. Step 6: Final answer
    x = 91.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.