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Finding the Fourth Proportional to 126.47, 174.55 and 79.86

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Solution

The fourth proportional to 126.47, 174.55 and 79.86 is: 110.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.47 : 174.55 = 79.86 : x
  2. Step 2: Convert to fraction form
    126.47/174.55 = 79.86/x
  3. Step 3: Cross multiply
    126.47x = 174.55 × 79.86
  4. Step 4: Simplify right side
    126.47x = 13,939.56
  5. Step 5: Solve for x
    x = 13,939.56/126.47
  6. Step 6: Final answer
    x = 110.22

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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.