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Finding the Fourth Proportional to 809.65, 1,214.43 and 261.82

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Solution

The fourth proportional to 809.65, 1,214.43 and 261.82 is: 392.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.65 : 1,214.43 = 261.82 : x
  2. Step 2: Convert to fraction form
    809.65/1,214.43 = 261.82/x
  3. Step 3: Cross multiply
    809.65x = 1,214.43 × 261.82
  4. Step 4: Simplify right side
    809.65x = 317,955.99
  5. Step 5: Solve for x
    x = 317,955.99/809.65
  6. Step 6: Final answer
    x = 392.71

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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.