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Finding the Fourth Proportional to 84.50, 126.49 and 68.10

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Solution

The fourth proportional to 84.50, 126.49 and 68.10 is: 101.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.50 : 126.49 = 68.10 : x
  2. Step 2: Convert to fraction form
    84.50/126.49 = 68.10/x
  3. Step 3: Cross multiply
    84.50x = 126.49 × 68.10
  4. Step 4: Simplify right side
    84.50x = 8,613.80
  5. Step 5: Solve for x
    x = 8,613.80/84.50
  6. Step 6: Final answer
    x = 101.94

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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.