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Finding the Fourth Proportional to 126.72, 191.12 and 108.90

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Solution

The fourth proportional to 126.72, 191.12 and 108.90 is: 164.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.72 : 191.12 = 108.90 : x
  2. Step 2: Convert to fraction form
    126.72/191.12 = 108.90/x
  3. Step 3: Cross multiply
    126.72x = 191.12 × 108.90
  4. Step 4: Simplify right side
    126.72x = 20,812.42
  5. Step 5: Solve for x
    x = 20,812.42/126.72
  6. Step 6: Final answer
    x = 164.24

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.