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Finding the Fourth Proportional to 869.62, 1,305 and 811.96

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Solution

The fourth proportional to 869.62, 1,305 and 811.96 is: 1,218.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.62 : 1,305 = 811.96 : x
  2. Step 2: Convert to fraction form
    869.62/1,305 = 811.96/x
  3. Step 3: Cross multiply
    869.62x = 1,305 × 811.96
  4. Step 4: Simplify right side
    869.62x = 1,059,607.80
  5. Step 5: Solve for x
    x = 1,059,607.80/869.62
  6. Step 6: Final answer
    x = 1,218.47

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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.