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Finding the Fourth Proportional to 84.13, 126.21 and 55.30

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Solution

The fourth proportional to 84.13, 126.21 and 55.30 is: 82.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.13 : 126.21 = 55.30 : x
  2. Step 2: Convert to fraction form
    84.13/126.21 = 55.30/x
  3. Step 3: Cross multiply
    84.13x = 126.21 × 55.30
  4. Step 4: Simplify right side
    84.13x = 6,979.41
  5. Step 5: Solve for x
    x = 6,979.41/84.13
  6. Step 6: Final answer
    x = 82.96

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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.