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Finding the Fourth Proportional to 83.91, 115.79 and 46.56

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Solution

The fourth proportional to 83.91, 115.79 and 46.56 is: 64.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.91 : 115.79 = 46.56 : x
  2. Step 2: Convert to fraction form
    83.91/115.79 = 46.56/x
  3. Step 3: Cross multiply
    83.91x = 115.79 × 46.56
  4. Step 4: Simplify right side
    83.91x = 5,391.24
  5. Step 5: Solve for x
    x = 5,391.24/83.91
  6. Step 6: Final answer
    x = 64.25

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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.