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Finding the Fourth Proportional to 774.12, 1,160.92 and 311.78

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Solution

The fourth proportional to 774.12, 1,160.92 and 311.78 is: 467.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    774.12 : 1,160.92 = 311.78 : x
  2. Step 2: Convert to fraction form
    774.12/1,160.92 = 311.78/x
  3. Step 3: Cross multiply
    774.12x = 1,160.92 × 311.78
  4. Step 4: Simplify right side
    774.12x = 361,954.93
  5. Step 5: Solve for x
    x = 361,954.93/774.12
  6. Step 6: Final answer
    x = 467.57

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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.