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Finding the Fourth Proportional to 443.12, 663.67 and 212.18

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Solution

The fourth proportional to 443.12, 663.67 and 212.18 is: 317.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.12 : 663.67 = 212.18 : x
  2. Step 2: Convert to fraction form
    443.12/663.67 = 212.18/x
  3. Step 3: Cross multiply
    443.12x = 663.67 × 212.18
  4. Step 4: Simplify right side
    443.12x = 140,813.25
  5. Step 5: Solve for x
    x = 140,813.25/443.12
  6. Step 6: Final answer
    x = 317.78

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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.