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Finding the Fourth Proportional to 84.28, 126.40 and 29.43

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Solution

The fourth proportional to 84.28, 126.40 and 29.43 is: 44.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.28 : 126.40 = 29.43 : x
  2. Step 2: Convert to fraction form
    84.28/126.40 = 29.43/x
  3. Step 3: Cross multiply
    84.28x = 126.40 × 29.43
  4. Step 4: Simplify right side
    84.28x = 3,719.95
  5. Step 5: Solve for x
    x = 3,719.95/84.28
  6. Step 6: Final answer
    x = 44.14

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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.