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Finding the Fourth Proportional to 906.25, 1,251.64 and 611

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Solution

The fourth proportional to 906.25, 1,251.64 and 611 is: 843.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.25 : 1,251.64 = 611 : x
  2. Step 2: Convert to fraction form
    906.25/1,251.64 = 611/x
  3. Step 3: Cross multiply
    906.25x = 1,251.64 × 611
  4. Step 4: Simplify right side
    906.25x = 764,752.04
  5. Step 5: Solve for x
    x = 764,752.04/906.25
  6. Step 6: Final answer
    x = 843.87

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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.