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Finding the Fourth Proportional to 766.98, 1,149.12 and 279.72

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Solution

The fourth proportional to 766.98, 1,149.12 and 279.72 is: 419.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.98 : 1,149.12 = 279.72 : x
  2. Step 2: Convert to fraction form
    766.98/1,149.12 = 279.72/x
  3. Step 3: Cross multiply
    766.98x = 1,149.12 × 279.72
  4. Step 4: Simplify right side
    766.98x = 321,431.85
  5. Step 5: Solve for x
    x = 321,431.85/766.98
  6. Step 6: Final answer
    x = 419.09

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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.