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Finding the Fourth Proportional to 127.80, 191.45 and 66.96

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Solution

The fourth proportional to 127.80, 191.45 and 66.96 is: 100.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.80 : 191.45 = 66.96 : x
  2. Step 2: Convert to fraction form
    127.80/191.45 = 66.96/x
  3. Step 3: Cross multiply
    127.80x = 191.45 × 66.96
  4. Step 4: Simplify right side
    127.80x = 12,819.66
  5. Step 5: Solve for x
    x = 12,819.66/127.80
  6. Step 6: Final answer
    x = 100.31

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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.