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Finding the Fourth Proportional to 84.85, 116.96 and 69.91

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Solution

The fourth proportional to 84.85, 116.96 and 69.91 is: 96.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.85 : 116.96 = 69.91 : x
  2. Step 2: Convert to fraction form
    84.85/116.96 = 69.91/x
  3. Step 3: Cross multiply
    84.85x = 116.96 × 69.91
  4. Step 4: Simplify right side
    84.85x = 8,177.08
  5. Step 5: Solve for x
    x = 8,177.08/84.85
  6. Step 6: Final answer
    x = 96.37

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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.