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Finding the Fourth Proportional to 778.89, 1,168.91 and 316.83

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Solution

The fourth proportional to 778.89, 1,168.91 and 316.83 is: 475.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.89 : 1,168.91 = 316.83 : x
  2. Step 2: Convert to fraction form
    778.89/1,168.91 = 316.83/x
  3. Step 3: Cross multiply
    778.89x = 1,168.91 × 316.83
  4. Step 4: Simplify right side
    778.89x = 370,345.76
  5. Step 5: Solve for x
    x = 370,345.76/778.89
  6. Step 6: Final answer
    x = 475.48

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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.