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Finding the Fourth Proportional to 185.91, 278.90 and 77.72

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Solution

The fourth proportional to 185.91, 278.90 and 77.72 is: 116.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    185.91 : 278.90 = 77.72 : x
  2. Step 2: Convert to fraction form
    185.91/278.90 = 77.72/x
  3. Step 3: Cross multiply
    185.91x = 278.90 × 77.72
  4. Step 4: Simplify right side
    185.91x = 21,674.32
  5. Step 5: Solve for x
    x = 21,674.32/185.91
  6. Step 6: Final answer
    x = 116.59

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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.