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Finding the Fourth Proportional to 322.12, 444.12 and 285.20

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Solution

The fourth proportional to 322.12, 444.12 and 285.20 is: 393.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.12 : 444.12 = 285.20 : x
  2. Step 2: Convert to fraction form
    322.12/444.12 = 285.20/x
  3. Step 3: Cross multiply
    322.12x = 444.12 × 285.20
  4. Step 4: Simplify right side
    322.12x = 126,663.02
  5. Step 5: Solve for x
    x = 126,663.02/322.12
  6. Step 6: Final answer
    x = 393.22

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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.