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Finding the Fourth Proportional to 275.20, 379.76 and 158.76

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Solution

The fourth proportional to 275.20, 379.76 and 158.76 is: 219.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.20 : 379.76 = 158.76 : x
  2. Step 2: Convert to fraction form
    275.20/379.76 = 158.76/x
  3. Step 3: Cross multiply
    275.20x = 379.76 × 158.76
  4. Step 4: Simplify right side
    275.20x = 60,290.70
  5. Step 5: Solve for x
    x = 60,290.70/275.20
  6. Step 6: Final answer
    x = 219.08

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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.