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Finding the Fourth Proportional to 766.38, 1,148.94 and 279.12

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Solution

The fourth proportional to 766.38, 1,148.94 and 279.12 is: 418.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.38 : 1,148.94 = 279.12 : x
  2. Step 2: Convert to fraction form
    766.38/1,148.94 = 279.12/x
  3. Step 3: Cross multiply
    766.38x = 1,148.94 × 279.12
  4. Step 4: Simplify right side
    766.38x = 320,692.13
  5. Step 5: Solve for x
    x = 320,692.13/766.38
  6. Step 6: Final answer
    x = 418.45

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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.