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Finding the Fourth Proportional to 154.78, 213.70 and 113.39

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Solution

The fourth proportional to 154.78, 213.70 and 113.39 is: 156.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.78 : 213.70 = 113.39 : x
  2. Step 2: Convert to fraction form
    154.78/213.70 = 113.39/x
  3. Step 3: Cross multiply
    154.78x = 213.70 × 113.39
  4. Step 4: Simplify right side
    154.78x = 24,231.44
  5. Step 5: Solve for x
    x = 24,231.44/154.78
  6. Step 6: Final answer
    x = 156.56

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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.