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Finding the Fourth Proportional to 84.22, 126.76 and 75.84

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Solution

The fourth proportional to 84.22, 126.76 and 75.84 is: 114.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.22 : 126.76 = 75.84 : x
  2. Step 2: Convert to fraction form
    84.22/126.76 = 75.84/x
  3. Step 3: Cross multiply
    84.22x = 126.76 × 75.84
  4. Step 4: Simplify right side
    84.22x = 9,612.74
  5. Step 5: Solve for x
    x = 9,612.74/84.22
  6. Step 6: Final answer
    x = 114.13

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.