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Finding the Fourth Proportional to 84.18, 126.16 and 55.31

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Solution

The fourth proportional to 84.18, 126.16 and 55.31 is: 82.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.18 : 126.16 = 55.31 : x
  2. Step 2: Convert to fraction form
    84.18/126.16 = 55.31/x
  3. Step 3: Cross multiply
    84.18x = 126.16 × 55.31
  4. Step 4: Simplify right side
    84.18x = 6,977.00
  5. Step 5: Solve for x
    x = 6,977.00/84.18
  6. Step 6: Final answer
    x = 82.88

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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.