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Finding the Fourth Proportional to 185.44, 278.18 and 77.20

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Solution

The fourth proportional to 185.44, 278.18 and 77.20 is: 115.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.44 : 278.18 = 77.20 : x
  2. Step 2: Convert to fraction form
    185.44/278.18 = 77.20/x
  3. Step 3: Cross multiply
    185.44x = 278.18 × 77.20
  4. Step 4: Simplify right side
    185.44x = 21,476.70
  5. Step 5: Solve for x
    x = 21,476.70/185.44
  6. Step 6: Final answer
    x = 115.82

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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.