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Finding the Fourth Proportional to 809.49, 1,214.83 and 315.97

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Solution

The fourth proportional to 809.49, 1,214.83 and 315.97 is: 474.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.49 : 1,214.83 = 315.97 : x
  2. Step 2: Convert to fraction form
    809.49/1,214.83 = 315.97/x
  3. Step 3: Cross multiply
    809.49x = 1,214.83 × 315.97
  4. Step 4: Simplify right side
    809.49x = 383,849.84
  5. Step 5: Solve for x
    x = 383,849.84/809.49
  6. Step 6: Final answer
    x = 474.19

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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.