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Finding the Fourth Proportional to 379.28, 522.67 and 356.21

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Solution

The fourth proportional to 379.28, 522.67 and 356.21 is: 490.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.28 : 522.67 = 356.21 : x
  2. Step 2: Convert to fraction form
    379.28/522.67 = 356.21/x
  3. Step 3: Cross multiply
    379.28x = 522.67 × 356.21
  4. Step 4: Simplify right side
    379.28x = 186,182.34
  5. Step 5: Solve for x
    x = 186,182.34/379.28
  6. Step 6: Final answer
    x = 490.88

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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.