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Finding the Fourth Proportional to 126.16, 174.20 and 79.61

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Solution

The fourth proportional to 126.16, 174.20 and 79.61 is: 109.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.16 : 174.20 = 79.61 : x
  2. Step 2: Convert to fraction form
    126.16/174.20 = 79.61/x
  3. Step 3: Cross multiply
    126.16x = 174.20 × 79.61
  4. Step 4: Simplify right side
    126.16x = 13,866.79
  5. Step 5: Solve for x
    x = 13,866.79/126.16
  6. Step 6: Final answer
    x = 109.92

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.