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Finding the Fourth Proportional to 773.55, 1,069.20 and 679.59

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Solution

The fourth proportional to 773.55, 1,069.20 and 679.59 is: 939.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.55 : 1,069.20 = 679.59 : x
  2. Step 2: Convert to fraction form
    773.55/1,069.20 = 679.59/x
  3. Step 3: Cross multiply
    773.55x = 1,069.20 × 679.59
  4. Step 4: Simplify right side
    773.55x = 726,617.63
  5. Step 5: Solve for x
    x = 726,617.63/773.55
  6. Step 6: Final answer
    x = 939.33

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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.