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Finding the Fourth Proportional to 126.36, 174.31 and 79.71

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Solution

The fourth proportional to 126.36, 174.31 and 79.71 is: 109.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.36 : 174.31 = 79.71 : x
  2. Step 2: Convert to fraction form
    126.36/174.31 = 79.71/x
  3. Step 3: Cross multiply
    126.36x = 174.31 × 79.71
  4. Step 4: Simplify right side
    126.36x = 13,894.25
  5. Step 5: Solve for x
    x = 13,894.25/126.36
  6. Step 6: Final answer
    x = 109.96

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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.