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Finding the Fourth Proportional to 84.42, 126.47 and 75.66

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Solution

The fourth proportional to 84.42, 126.47 and 75.66 is: 113.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.42 : 126.47 = 75.66 : x
  2. Step 2: Convert to fraction form
    84.42/126.47 = 75.66/x
  3. Step 3: Cross multiply
    84.42x = 126.47 × 75.66
  4. Step 4: Simplify right side
    84.42x = 9,568.09
  5. Step 5: Solve for x
    x = 9,568.09/84.42
  6. Step 6: Final answer
    x = 113.35

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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.