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Finding the Fourth Proportional to 252.90, 379.44 and 212.40

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Solution

The fourth proportional to 252.90, 379.44 and 212.40 is: 318.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.90 : 379.44 = 212.40 : x
  2. Step 2: Convert to fraction form
    252.90/379.44 = 212.40/x
  3. Step 3: Cross multiply
    252.90x = 379.44 × 212.40
  4. Step 4: Simplify right side
    252.90x = 80,593.06
  5. Step 5: Solve for x
    x = 80,593.06/252.90
  6. Step 6: Final answer
    x = 318.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.