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Finding the Fourth Proportional to 443.45, 664.85 and 212.15

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Solution

The fourth proportional to 443.45, 664.85 and 212.15 is: 318.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.45 : 664.85 = 212.15 : x
  2. Step 2: Convert to fraction form
    443.45/664.85 = 212.15/x
  3. Step 3: Cross multiply
    443.45x = 664.85 × 212.15
  4. Step 4: Simplify right side
    443.45x = 141,050.12
  5. Step 5: Solve for x
    x = 141,050.12/443.45
  6. Step 6: Final answer
    x = 318.07

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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.