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Finding the Fourth Proportional to 778.94, 1,168.39 and 641.43

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Solution

The fourth proportional to 778.94, 1,168.39 and 641.43 is: 962.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.94 : 1,168.39 = 641.43 : x
  2. Step 2: Convert to fraction form
    778.94/1,168.39 = 641.43/x
  3. Step 3: Cross multiply
    778.94x = 1,168.39 × 641.43
  4. Step 4: Simplify right side
    778.94x = 749,437.19
  5. Step 5: Solve for x
    x = 749,437.19/778.94
  6. Step 6: Final answer
    x = 962.13

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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.