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Finding the Fourth Proportional to 809.76, 1,214.38 and 261.83

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Solution

The fourth proportional to 809.76, 1,214.38 and 261.83 is: 392.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    809.76 : 1,214.38 = 261.83 : x
  2. Step 2: Convert to fraction form
    809.76/1,214.38 = 261.83/x
  3. Step 3: Cross multiply
    809.76x = 1,214.38 × 261.83
  4. Step 4: Simplify right side
    809.76x = 317,961.12
  5. Step 5: Solve for x
    x = 317,961.12/809.76
  6. Step 6: Final answer
    x = 392.66

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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.