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Finding the Fourth Proportional to 275.18, 379.74 and 158.78

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Solution

The fourth proportional to 275.18, 379.74 and 158.78 is: 219.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.18 : 379.74 = 158.78 : x
  2. Step 2: Convert to fraction form
    275.18/379.74 = 158.78/x
  3. Step 3: Cross multiply
    275.18x = 379.74 × 158.78
  4. Step 4: Simplify right side
    275.18x = 60,295.12
  5. Step 5: Solve for x
    x = 60,295.12/275.18
  6. Step 6: Final answer
    x = 219.11

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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.