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Finding the Fourth Proportional to 126.78, 175.02 and 85.38

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Solution

The fourth proportional to 126.78, 175.02 and 85.38 is: 117.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.78 : 175.02 = 85.38 : x
  2. Step 2: Convert to fraction form
    126.78/175.02 = 85.38/x
  3. Step 3: Cross multiply
    126.78x = 175.02 × 85.38
  4. Step 4: Simplify right side
    126.78x = 14,943.21
  5. Step 5: Solve for x
    x = 14,943.21/126.78
  6. Step 6: Final answer
    x = 117.87

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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.