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Finding the Fourth Proportional to 185.85, 278.91 and 77.85

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Solution

The fourth proportional to 185.85, 278.91 and 77.85 is: 116.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.85 : 278.91 = 77.85 : x
  2. Step 2: Convert to fraction form
    185.85/278.91 = 77.85/x
  3. Step 3: Cross multiply
    185.85x = 278.91 × 77.85
  4. Step 4: Simplify right side
    185.85x = 21,713.14
  5. Step 5: Solve for x
    x = 21,713.14/185.85
  6. Step 6: Final answer
    x = 116.83

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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.