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Finding the Fourth Proportional to 838.81, 1,249.78 and 791.65

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Solution

The fourth proportional to 838.81, 1,249.78 and 791.65 is: 1,179.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.81 : 1,249.78 = 791.65 : x
  2. Step 2: Convert to fraction form
    838.81/1,249.78 = 791.65/x
  3. Step 3: Cross multiply
    838.81x = 1,249.78 × 791.65
  4. Step 4: Simplify right side
    838.81x = 989,385.89
  5. Step 5: Solve for x
    x = 989,385.89/838.81
  6. Step 6: Final answer
    x = 1,179.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.