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Finding the Fourth Proportional to 322.56, 445.20 and 297.90

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Solution

The fourth proportional to 322.56, 445.20 and 297.90 is: 411.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.56 : 445.20 = 297.90 : x
  2. Step 2: Convert to fraction form
    322.56/445.20 = 297.90/x
  3. Step 3: Cross multiply
    322.56x = 445.20 × 297.90
  4. Step 4: Simplify right side
    322.56x = 132,625.08
  5. Step 5: Solve for x
    x = 132,625.08/322.56
  6. Step 6: Final answer
    x = 411.16

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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.