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Finding the Fourth Proportional to 126.73, 174.90 and 71.47

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Solution

The fourth proportional to 126.73, 174.90 and 71.47 is: 98.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.73 : 174.90 = 71.47 : x
  2. Step 2: Convert to fraction form
    126.73/174.90 = 71.47/x
  3. Step 3: Cross multiply
    126.73x = 174.90 × 71.47
  4. Step 4: Simplify right side
    126.73x = 12,500.10
  5. Step 5: Solve for x
    x = 12,500.10/126.73
  6. Step 6: Final answer
    x = 98.64

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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.