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Finding the Fourth Proportional to 809.28, 1,213.86 and 322.44

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Solution

The fourth proportional to 809.28, 1,213.86 and 322.44 is: 483.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.28 : 1,213.86 = 322.44 : x
  2. Step 2: Convert to fraction form
    809.28/1,213.86 = 322.44/x
  3. Step 3: Cross multiply
    809.28x = 1,213.86 × 322.44
  4. Step 4: Simplify right side
    809.28x = 391,397.02
  5. Step 5: Solve for x
    x = 391,397.02/809.28
  6. Step 6: Final answer
    x = 483.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.