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Finding the Fourth Proportional to 84.28, 126.42 and 53.80

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Solution

The fourth proportional to 84.28, 126.42 and 53.80 is: 80.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.28 : 126.42 = 53.80 : x
  2. Step 2: Convert to fraction form
    84.28/126.42 = 53.80/x
  3. Step 3: Cross multiply
    84.28x = 126.42 × 53.80
  4. Step 4: Simplify right side
    84.28x = 6,801.40
  5. Step 5: Solve for x
    x = 6,801.40/84.28
  6. Step 6: Final answer
    x = 80.70

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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.