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Finding the Fourth Proportional to 158.78, 220.24 and 154.57

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Solution

The fourth proportional to 158.78, 220.24 and 154.57 is: 214.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.78 : 220.24 = 154.57 : x
  2. Step 2: Convert to fraction form
    158.78/220.24 = 154.57/x
  3. Step 3: Cross multiply
    158.78x = 220.24 × 154.57
  4. Step 4: Simplify right side
    158.78x = 34,042.61
  5. Step 5: Solve for x
    x = 34,042.61/158.78
  6. Step 6: Final answer
    x = 214.40

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.