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Finding the Fourth Proportional to 91.07, 125.80 and 66.64

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Solution

The fourth proportional to 91.07, 125.80 and 66.64 is: 92.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.07 : 125.80 = 66.64 : x
  2. Step 2: Convert to fraction form
    91.07/125.80 = 66.64/x
  3. Step 3: Cross multiply
    91.07x = 125.80 × 66.64
  4. Step 4: Simplify right side
    91.07x = 8,383.46
  5. Step 5: Solve for x
    x = 8,383.46/91.07
  6. Step 6: Final answer
    x = 92.06

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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.