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Finding the Fourth Proportional to 84.00, 125.92 and 42.84

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Solution

The fourth proportional to 84.00, 125.92 and 42.84 is: 64.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.00 : 125.92 = 42.84 : x
  2. Step 2: Convert to fraction form
    84.00/125.92 = 42.84/x
  3. Step 3: Cross multiply
    84.00x = 125.92 × 42.84
  4. Step 4: Simplify right side
    84.00x = 5,393.57
  5. Step 5: Solve for x
    x = 5,393.57/84.00
  6. Step 6: Final answer
    x = 64.21

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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.