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Finding the Fourth Proportional to 908.64, 1,251.09 and 775.62

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Solution

The fourth proportional to 908.64, 1,251.09 and 775.62 is: 1,067.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.64 : 1,251.09 = 775.62 : x
  2. Step 2: Convert to fraction form
    908.64/1,251.09 = 775.62/x
  3. Step 3: Cross multiply
    908.64x = 1,251.09 × 775.62
  4. Step 4: Simplify right side
    908.64x = 970,370.43
  5. Step 5: Solve for x
    x = 970,370.43/908.64
  6. Step 6: Final answer
    x = 1,067.94

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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.