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Finding the Fourth Proportional to 809.94, 1,213.98 and 322.86

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Solution

The fourth proportional to 809.94, 1,213.98 and 322.86 is: 483.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.94 : 1,213.98 = 322.86 : x
  2. Step 2: Convert to fraction form
    809.94/1,213.98 = 322.86/x
  3. Step 3: Cross multiply
    809.94x = 1,213.98 × 322.86
  4. Step 4: Simplify right side
    809.94x = 391,945.58
  5. Step 5: Solve for x
    x = 391,945.58/809.94
  6. Step 6: Final answer
    x = 483.92

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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.