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Finding the Fourth Proportional to 778.96, 1,168.35 and 265.96

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Solution

The fourth proportional to 778.96, 1,168.35 and 265.96 is: 398.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.96 : 1,168.35 = 265.96 : x
  2. Step 2: Convert to fraction form
    778.96/1,168.35 = 265.96/x
  3. Step 3: Cross multiply
    778.96x = 1,168.35 × 265.96
  4. Step 4: Simplify right side
    778.96x = 310,734.37
  5. Step 5: Solve for x
    x = 310,734.37/778.96
  6. Step 6: Final answer
    x = 398.91

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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.