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Finding the Fourth Proportional to 84.71, 126.83 and 57.61

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Solution

The fourth proportional to 84.71, 126.83 and 57.61 is: 86.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.71 : 126.83 = 57.61 : x
  2. Step 2: Convert to fraction form
    84.71/126.83 = 57.61/x
  3. Step 3: Cross multiply
    84.71x = 126.83 × 57.61
  4. Step 4: Simplify right side
    84.71x = 7,306.98
  5. Step 5: Solve for x
    x = 7,306.98/84.71
  6. Step 6: Final answer
    x = 86.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.