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Finding the Fourth Proportional to 83.21, 124.49 and 55.34

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Solution

The fourth proportional to 83.21, 124.49 and 55.34 is: 82.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.21 : 124.49 = 55.34 : x
  2. Step 2: Convert to fraction form
    83.21/124.49 = 55.34/x
  3. Step 3: Cross multiply
    83.21x = 124.49 × 55.34
  4. Step 4: Simplify right side
    83.21x = 6,888.79
  5. Step 5: Solve for x
    x = 6,888.79/83.21
  6. Step 6: Final answer
    x = 82.79

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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.