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Finding the Fourth Proportional to 379.90, 522.88 and 330.49

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Solution

The fourth proportional to 379.90, 522.88 and 330.49 is: 454.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.90 : 522.88 = 330.49 : x
  2. Step 2: Convert to fraction form
    379.90/522.88 = 330.49/x
  3. Step 3: Cross multiply
    379.90x = 522.88 × 330.49
  4. Step 4: Simplify right side
    379.90x = 172,806.61
  5. Step 5: Solve for x
    x = 172,806.61/379.90
  6. Step 6: Final answer
    x = 454.87

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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.