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Finding the Fourth Proportional to 126.18, 174.07 and 86.85

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Solution

The fourth proportional to 126.18, 174.07 and 86.85 is: 119.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.18 : 174.07 = 86.85 : x
  2. Step 2: Convert to fraction form
    126.18/174.07 = 86.85/x
  3. Step 3: Cross multiply
    126.18x = 174.07 × 86.85
  4. Step 4: Simplify right side
    126.18x = 15,117.84
  5. Step 5: Solve for x
    x = 15,117.84/126.18
  6. Step 6: Final answer
    x = 119.81

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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.