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Finding the Fourth Proportional to 126.41, 174.53 and 89.61

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Solution

The fourth proportional to 126.41, 174.53 and 89.61 is: 123.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.41 : 174.53 = 89.61 : x
  2. Step 2: Convert to fraction form
    126.41/174.53 = 89.61/x
  3. Step 3: Cross multiply
    126.41x = 174.53 × 89.61
  4. Step 4: Simplify right side
    126.41x = 15,638.95
  5. Step 5: Solve for x
    x = 15,638.95/126.41
  6. Step 6: Final answer
    x = 123.72

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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.