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Finding the Fourth Proportional to 84.24, 125.85 and 61.43

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Solution

The fourth proportional to 84.24, 125.85 and 61.43 is: 91.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.24 : 125.85 = 61.43 : x
  2. Step 2: Convert to fraction form
    84.24/125.85 = 61.43/x
  3. Step 3: Cross multiply
    84.24x = 125.85 × 61.43
  4. Step 4: Simplify right side
    84.24x = 7,730.57
  5. Step 5: Solve for x
    x = 7,730.57/84.24
  6. Step 6: Final answer
    x = 91.77

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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.