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Finding the Fourth Proportional to 779.39, 1,169.30 and 641.79

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Solution

The fourth proportional to 779.39, 1,169.30 and 641.79 is: 962.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.39 : 1,169.30 = 641.79 : x
  2. Step 2: Convert to fraction form
    779.39/1,169.30 = 641.79/x
  3. Step 3: Cross multiply
    779.39x = 1,169.30 × 641.79
  4. Step 4: Simplify right side
    779.39x = 750,439.20
  5. Step 5: Solve for x
    x = 750,439.20/779.39
  6. Step 6: Final answer
    x = 962.86

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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.