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Finding the Fourth Proportional to 442.96, 664.28 and 212.11

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Solution

The fourth proportional to 442.96, 664.28 and 212.11 is: 318.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.96 : 664.28 = 212.11 : x
  2. Step 2: Convert to fraction form
    442.96/664.28 = 212.11/x
  3. Step 3: Cross multiply
    442.96x = 664.28 × 212.11
  4. Step 4: Simplify right side
    442.96x = 140,897.11
  5. Step 5: Solve for x
    x = 140,897.11/442.96
  6. Step 6: Final answer
    x = 318.08

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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.