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Finding the Fourth Proportional to 154.96, 213.87 and 113.65

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Solution

The fourth proportional to 154.96, 213.87 and 113.65 is: 156.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.96 : 213.87 = 113.65 : x
  2. Step 2: Convert to fraction form
    154.96/213.87 = 113.65/x
  3. Step 3: Cross multiply
    154.96x = 213.87 × 113.65
  4. Step 4: Simplify right side
    154.96x = 24,306.33
  5. Step 5: Solve for x
    x = 24,306.33/154.96
  6. Step 6: Final answer
    x = 156.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.