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Finding the Fourth Proportional to 84.74, 126.38 and 77.74

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Solution

The fourth proportional to 84.74, 126.38 and 77.74 is: 115.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.74 : 126.38 = 77.74 : x
  2. Step 2: Convert to fraction form
    84.74/126.38 = 77.74/x
  3. Step 3: Cross multiply
    84.74x = 126.38 × 77.74
  4. Step 4: Simplify right side
    84.74x = 9,824.78
  5. Step 5: Solve for x
    x = 9,824.78/84.74
  6. Step 6: Final answer
    x = 115.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.