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Finding the Fourth Proportional to 84.62, 116.78 and 61.31

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Solution

The fourth proportional to 84.62, 116.78 and 61.31 is: 84.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.62 : 116.78 = 61.31 : x
  2. Step 2: Convert to fraction form
    84.62/116.78 = 61.31/x
  3. Step 3: Cross multiply
    84.62x = 116.78 × 61.31
  4. Step 4: Simplify right side
    84.62x = 7,158.89
  5. Step 5: Solve for x
    x = 7,158.89/84.62
  6. Step 6: Final answer
    x = 84.61

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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.