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Finding the Fourth Proportional to 83.94, 115.85 and 51.21

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Solution

The fourth proportional to 83.94, 115.85 and 51.21 is: 70.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.94 : 115.85 = 51.21 : x
  2. Step 2: Convert to fraction form
    83.94/115.85 = 51.21/x
  3. Step 3: Cross multiply
    83.94x = 115.85 × 51.21
  4. Step 4: Simplify right side
    83.94x = 5,932.68
  5. Step 5: Solve for x
    x = 5,932.68/83.94
  6. Step 6: Final answer
    x = 70.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.