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Finding the Fourth Proportional to 154.46, 231.71 and 51.78

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Solution

The fourth proportional to 154.46, 231.71 and 51.78 is: 77.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.46 : 231.71 = 51.78 : x
  2. Step 2: Convert to fraction form
    154.46/231.71 = 51.78/x
  3. Step 3: Cross multiply
    154.46x = 231.71 × 51.78
  4. Step 4: Simplify right side
    154.46x = 11,997.94
  5. Step 5: Solve for x
    x = 11,997.94/154.46
  6. Step 6: Final answer
    x = 77.68

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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.