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Finding the Fourth Proportional to 275.79, 379.86 and 238.95

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Solution

The fourth proportional to 275.79, 379.86 and 238.95 is: 329.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.79 : 379.86 = 238.95 : x
  2. Step 2: Convert to fraction form
    275.79/379.86 = 238.95/x
  3. Step 3: Cross multiply
    275.79x = 379.86 × 238.95
  4. Step 4: Simplify right side
    275.79x = 90,767.55
  5. Step 5: Solve for x
    x = 90,767.55/275.79
  6. Step 6: Final answer
    x = 329.12

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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.