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Finding the Fourth Proportional to 794.68, 1,191.61 and 640.92

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Solution

The fourth proportional to 794.68, 1,191.61 and 640.92 is: 961.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    794.68 : 1,191.61 = 640.92 : x
  2. Step 2: Convert to fraction form
    794.68/1,191.61 = 640.92/x
  3. Step 3: Cross multiply
    794.68x = 1,191.61 × 640.92
  4. Step 4: Simplify right side
    794.68x = 763,726.68
  5. Step 5: Solve for x
    x = 763,726.68/794.68
  6. Step 6: Final answer
    x = 961.05

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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.