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Finding the Fourth Proportional to 856.97, 1,286.88 and 813.12

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Solution

The fourth proportional to 856.97, 1,286.88 and 813.12 is: 1,221.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.97 : 1,286.88 = 813.12 : x
  2. Step 2: Convert to fraction form
    856.97/1,286.88 = 813.12/x
  3. Step 3: Cross multiply
    856.97x = 1,286.88 × 813.12
  4. Step 4: Simplify right side
    856.97x = 1,046,387.87
  5. Step 5: Solve for x
    x = 1,046,387.87/856.97
  6. Step 6: Final answer
    x = 1,221.04

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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.