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Finding the Fourth Proportional to 83.34, 124.80 and 69.78

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Solution

The fourth proportional to 83.34, 124.80 and 69.78 is: 104.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.34 : 124.80 = 69.78 : x
  2. Step 2: Convert to fraction form
    83.34/124.80 = 69.78/x
  3. Step 3: Cross multiply
    83.34x = 124.80 × 69.78
  4. Step 4: Simplify right side
    83.34x = 8,708.54
  5. Step 5: Solve for x
    x = 8,708.54/83.34
  6. Step 6: Final answer
    x = 104.49

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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.