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Finding the Fourth Proportional to 275.48, 379.99 and 238.57

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Solution

The fourth proportional to 275.48, 379.99 and 238.57 is: 329.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.48 : 379.99 = 238.57 : x
  2. Step 2: Convert to fraction form
    275.48/379.99 = 238.57/x
  3. Step 3: Cross multiply
    275.48x = 379.99 × 238.57
  4. Step 4: Simplify right side
    275.48x = 90,654.99
  5. Step 5: Solve for x
    x = 90,654.99/275.48
  6. Step 6: Final answer
    x = 329.08

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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.