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Finding the Fourth Proportional to 809.62, 1,214.21 and 261.65

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Solution

The fourth proportional to 809.62, 1,214.21 and 261.65 is: 392.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.62 : 1,214.21 = 261.65 : x
  2. Step 2: Convert to fraction form
    809.62/1,214.21 = 261.65/x
  3. Step 3: Cross multiply
    809.62x = 1,214.21 × 261.65
  4. Step 4: Simplify right side
    809.62x = 317,701.74
  5. Step 5: Solve for x
    x = 317,701.74/809.62
  6. Step 6: Final answer
    x = 392.41

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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.