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Finding the Fourth Proportional to 83.82, 125.70 and 56.78

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Solution

The fourth proportional to 83.82, 125.70 and 56.78 is: 85.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.82 : 125.70 = 56.78 : x
  2. Step 2: Convert to fraction form
    83.82/125.70 = 56.78/x
  3. Step 3: Cross multiply
    83.82x = 125.70 × 56.78
  4. Step 4: Simplify right side
    83.82x = 7,137.25
  5. Step 5: Solve for x
    x = 7,137.25/83.82
  6. Step 6: Final answer
    x = 85.15

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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.