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Finding the Fourth Proportional to 154.68, 231.78 and 81.48

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Solution

The fourth proportional to 154.68, 231.78 and 81.48 is: 122.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.68 : 231.78 = 81.48 : x
  2. Step 2: Convert to fraction form
    154.68/231.78 = 81.48/x
  3. Step 3: Cross multiply
    154.68x = 231.78 × 81.48
  4. Step 4: Simplify right side
    154.68x = 18,885.43
  5. Step 5: Solve for x
    x = 18,885.43/154.68
  6. Step 6: Final answer
    x = 122.09

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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.