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Finding the Fourth Proportional to 443.90, 665.38 and 212.68

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Solution

The fourth proportional to 443.90, 665.38 and 212.68 is: 318.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.90 : 665.38 = 212.68 : x
  2. Step 2: Convert to fraction form
    443.90/665.38 = 212.68/x
  3. Step 3: Cross multiply
    443.90x = 665.38 × 212.68
  4. Step 4: Simplify right side
    443.90x = 141,513.02
  5. Step 5: Solve for x
    x = 141,513.02/443.90
  6. Step 6: Final answer
    x = 318.79

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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.