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Finding the Fourth Proportional to 766.44, 1,149.80 and 279.84

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Solution

The fourth proportional to 766.44, 1,149.80 and 279.84 is: 419.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.44 : 1,149.80 = 279.84 : x
  2. Step 2: Convert to fraction form
    766.44/1,149.80 = 279.84/x
  3. Step 3: Cross multiply
    766.44x = 1,149.80 × 279.84
  4. Step 4: Simplify right side
    766.44x = 321,760.03
  5. Step 5: Solve for x
    x = 321,760.03/766.44
  6. Step 6: Final answer
    x = 419.81

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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.