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Finding the Fourth Proportional to 127.68, 191.36 and 66.78

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Solution

The fourth proportional to 127.68, 191.36 and 66.78 is: 100.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.68 : 191.36 = 66.78 : x
  2. Step 2: Convert to fraction form
    127.68/191.36 = 66.78/x
  3. Step 3: Cross multiply
    127.68x = 191.36 × 66.78
  4. Step 4: Simplify right side
    127.68x = 12,778.69
  5. Step 5: Solve for x
    x = 12,778.69/127.68
  6. Step 6: Final answer
    x = 100.08

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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.