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Finding the Fourth Proportional to 443.48, 665.32 and 212.30

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Solution

The fourth proportional to 443.48, 665.32 and 212.30 is: 318.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.48 : 665.32 = 212.30 : x
  2. Step 2: Convert to fraction form
    443.48/665.32 = 212.30/x
  3. Step 3: Cross multiply
    443.48x = 665.32 × 212.30
  4. Step 4: Simplify right side
    443.48x = 141,243.05
  5. Step 5: Solve for x
    x = 141,243.05/443.48
  6. Step 6: Final answer
    x = 318.49

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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.