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Finding the Fourth Proportional to 322.86, 445.49 and 212.12

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Solution

The fourth proportional to 322.86, 445.49 and 212.12 is: 292.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.86 : 445.49 = 212.12 : x
  2. Step 2: Convert to fraction form
    322.86/445.49 = 212.12/x
  3. Step 3: Cross multiply
    322.86x = 445.49 × 212.12
  4. Step 4: Simplify right side
    322.86x = 94,497.34
  5. Step 5: Solve for x
    x = 94,497.34/322.86
  6. Step 6: Final answer
    x = 292.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.