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Finding the Fourth Proportional to 809.33, 1,214.61 and 322.43

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Solution

The fourth proportional to 809.33, 1,214.61 and 322.43 is: 483.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.33 : 1,214.61 = 322.43 : x
  2. Step 2: Convert to fraction form
    809.33/1,214.61 = 322.43/x
  3. Step 3: Cross multiply
    809.33x = 1,214.61 × 322.43
  4. Step 4: Simplify right side
    809.33x = 391,620.63
  5. Step 5: Solve for x
    x = 391,620.63/809.33
  6. Step 6: Final answer
    x = 483.89

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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.