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Finding the Fourth Proportional to 84.55, 126.81 and 33.15

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Solution

The fourth proportional to 84.55, 126.81 and 33.15 is: 49.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.55 : 126.81 = 33.15 : x
  2. Step 2: Convert to fraction form
    84.55/126.81 = 33.15/x
  3. Step 3: Cross multiply
    84.55x = 126.81 × 33.15
  4. Step 4: Simplify right side
    84.55x = 4,203.99
  5. Step 5: Solve for x
    x = 4,203.99/84.55
  6. Step 6: Final answer
    x = 49.72

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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.