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Finding the Fourth Proportional to 185.80, 278.60 and 77.72

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Solution

The fourth proportional to 185.80, 278.60 and 77.72 is: 116.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.80 : 278.60 = 77.72 : x
  2. Step 2: Convert to fraction form
    185.80/278.60 = 77.72/x
  3. Step 3: Cross multiply
    185.80x = 278.60 × 77.72
  4. Step 4: Simplify right side
    185.80x = 21,652.79
  5. Step 5: Solve for x
    x = 21,652.79/185.80
  6. Step 6: Final answer
    x = 116.54

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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.