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Finding the Fourth Proportional to 378.98, 522.92 and 213.19

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Solution

The fourth proportional to 378.98, 522.92 and 213.19 is: 294.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.98 : 522.92 = 213.19 : x
  2. Step 2: Convert to fraction form
    378.98/522.92 = 213.19/x
  3. Step 3: Cross multiply
    378.98x = 522.92 × 213.19
  4. Step 4: Simplify right side
    378.98x = 111,480.78
  5. Step 5: Solve for x
    x = 111,480.78/378.98
  6. Step 6: Final answer
    x = 294.16

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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.