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Finding the Fourth Proportional to 91.19, 125.70 and 66.59

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Solution

The fourth proportional to 91.19, 125.70 and 66.59 is: 91.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.19 : 125.70 = 66.59 : x
  2. Step 2: Convert to fraction form
    91.19/125.70 = 66.59/x
  3. Step 3: Cross multiply
    91.19x = 125.70 × 66.59
  4. Step 4: Simplify right side
    91.19x = 8,369.73
  5. Step 5: Solve for x
    x = 8,369.73/91.19
  6. Step 6: Final answer
    x = 91.79

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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.