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Finding the Fourth Proportional to 774.62, 1,167.25 and 640.68

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Solution

The fourth proportional to 774.62, 1,167.25 and 640.68 is: 965.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.62 : 1,167.25 = 640.68 : x
  2. Step 2: Convert to fraction form
    774.62/1,167.25 = 640.68/x
  3. Step 3: Cross multiply
    774.62x = 1,167.25 × 640.68
  4. Step 4: Simplify right side
    774.62x = 747,833.73
  5. Step 5: Solve for x
    x = 747,833.73/774.62
  6. Step 6: Final answer
    x = 965.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.