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Finding the Fourth Proportional to 126.19, 173.98 and 91.19

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Solution

The fourth proportional to 126.19, 173.98 and 91.19 is: 125.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.19 : 173.98 = 91.19 : x
  2. Step 2: Convert to fraction form
    126.19/173.98 = 91.19/x
  3. Step 3: Cross multiply
    126.19x = 173.98 × 91.19
  4. Step 4: Simplify right side
    126.19x = 15,865.79
  5. Step 5: Solve for x
    x = 15,865.79/126.19
  6. Step 6: Final answer
    x = 125.73

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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.