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Finding the Fourth Proportional to 84.28, 126.40 and 57.38

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Solution

The fourth proportional to 84.28, 126.40 and 57.38 is: 86.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.28 : 126.40 = 57.38 : x
  2. Step 2: Convert to fraction form
    84.28/126.40 = 57.38/x
  3. Step 3: Cross multiply
    84.28x = 126.40 × 57.38
  4. Step 4: Simplify right side
    84.28x = 7,252.83
  5. Step 5: Solve for x
    x = 7,252.83/84.28
  6. Step 6: Final answer
    x = 86.06

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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.