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Finding the Fourth Proportional to 127.72, 191.63 and 66.90

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Solution

The fourth proportional to 127.72, 191.63 and 66.90 is: 100.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.72 : 191.63 = 66.90 : x
  2. Step 2: Convert to fraction form
    127.72/191.63 = 66.90/x
  3. Step 3: Cross multiply
    127.72x = 191.63 × 66.90
  4. Step 4: Simplify right side
    127.72x = 12,820.05
  5. Step 5: Solve for x
    x = 12,820.05/127.72
  6. Step 6: Final answer
    x = 100.38

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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.