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Finding the Fourth Proportional to 83.78, 116.15 and 79.67

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Solution

The fourth proportional to 83.78, 116.15 and 79.67 is: 110.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.78 : 116.15 = 79.67 : x
  2. Step 2: Convert to fraction form
    83.78/116.15 = 79.67/x
  3. Step 3: Cross multiply
    83.78x = 116.15 × 79.67
  4. Step 4: Simplify right side
    83.78x = 9,252.69
  5. Step 5: Solve for x
    x = 9,252.69/83.78
  6. Step 6: Final answer
    x = 110.45

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.