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Finding the Fourth Proportional to 83.89, 115.86 and 70.82

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Solution

The fourth proportional to 83.89, 115.86 and 70.82 is: 97.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.89 : 115.86 = 70.82 : x
  2. Step 2: Convert to fraction form
    83.89/115.86 = 70.82/x
  3. Step 3: Cross multiply
    83.89x = 115.86 × 70.82
  4. Step 4: Simplify right side
    83.89x = 8,204.63
  5. Step 5: Solve for x
    x = 8,204.63/83.89
  6. Step 6: Final answer
    x = 97.81

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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.