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Finding the Fourth Proportional to 127.89, 191.48 and 66.74

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Solution

The fourth proportional to 127.89, 191.48 and 66.74 is: 99.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.89 : 191.48 = 66.74 : x
  2. Step 2: Convert to fraction form
    127.89/191.48 = 66.74/x
  3. Step 3: Cross multiply
    127.89x = 191.48 × 66.74
  4. Step 4: Simplify right side
    127.89x = 12,778.08
  5. Step 5: Solve for x
    x = 12,778.08/127.89
  6. Step 6: Final answer
    x = 99.91

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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.