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Finding the Fourth Proportional to 127.64, 191.45 and 66.75

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Solution

The fourth proportional to 127.64, 191.45 and 66.75 is: 100.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.64 : 191.45 = 66.75 : x
  2. Step 2: Convert to fraction form
    127.64/191.45 = 66.75/x
  3. Step 3: Cross multiply
    127.64x = 191.45 × 66.75
  4. Step 4: Simplify right side
    127.64x = 12,778.95
  5. Step 5: Solve for x
    x = 12,778.95/127.64
  6. Step 6: Final answer
    x = 100.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.