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Finding the Fourth Proportional to 126.40, 174.28 and 87.60

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Solution

The fourth proportional to 126.40, 174.28 and 87.60 is: 120.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.40 : 174.28 = 87.60 : x
  2. Step 2: Convert to fraction form
    126.40/174.28 = 87.60/x
  3. Step 3: Cross multiply
    126.40x = 174.28 × 87.60
  4. Step 4: Simplify right side
    126.40x = 15,266.93
  5. Step 5: Solve for x
    x = 15,266.93/126.40
  6. Step 6: Final answer
    x = 120.78

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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.