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Finding the Fourth Proportional to 322.85, 445.53 and 212.39

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Solution

The fourth proportional to 322.85, 445.53 and 212.39 is: 293.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.85 : 445.53 = 212.39 : x
  2. Step 2: Convert to fraction form
    322.85/445.53 = 212.39/x
  3. Step 3: Cross multiply
    322.85x = 445.53 × 212.39
  4. Step 4: Simplify right side
    322.85x = 94,626.36
  5. Step 5: Solve for x
    x = 94,626.36/322.85
  6. Step 6: Final answer
    x = 293.09

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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.