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Finding the Fourth Proportional to 1,286.24, 1,775 and 696.78

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Solution

The fourth proportional to 1,286.24, 1,775 and 696.78 is: 961.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.24 : 1,775 = 696.78 : x
  2. Step 2: Convert to fraction form
    1,286.24/1,775 = 696.78/x
  3. Step 3: Cross multiply
    1,286.24x = 1,775 × 696.78
  4. Step 4: Simplify right side
    1,286.24x = 1,236,784.50
  5. Step 5: Solve for x
    x = 1,236,784.50/1,286.24
  6. Step 6: Final answer
    x = 961.55

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.