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Finding the Fourth Proportional to 126.67, 174.80 and 71.40

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Solution

The fourth proportional to 126.67, 174.80 and 71.40 is: 98.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.67 : 174.80 = 71.40 : x
  2. Step 2: Convert to fraction form
    126.67/174.80 = 71.40/x
  3. Step 3: Cross multiply
    126.67x = 174.80 × 71.40
  4. Step 4: Simplify right side
    126.67x = 12,480.89
  5. Step 5: Solve for x
    x = 12,480.89/126.67
  6. Step 6: Final answer
    x = 98.53

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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.