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Finding the Fourth Proportional to 322.81, 445.68 and 212.47

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Solution

The fourth proportional to 322.81, 445.68 and 212.47 is: 293.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.81 : 445.68 = 212.47 : x
  2. Step 2: Convert to fraction form
    322.81/445.68 = 212.47/x
  3. Step 3: Cross multiply
    322.81x = 445.68 × 212.47
  4. Step 4: Simplify right side
    322.81x = 94,693.17
  5. Step 5: Solve for x
    x = 94,693.17/322.81
  6. Step 6: Final answer
    x = 293.34

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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.