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Finding the Fourth Proportional to 2,089.85, 3,135.69 and 791.02

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Solution

The fourth proportional to 2,089.85, 3,135.69 and 791.02 is: 1,186.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,089.85 : 3,135.69 = 791.02 : x
  2. Step 2: Convert to fraction form
    2,089.85/3,135.69 = 791.02/x
  3. Step 3: Cross multiply
    2,089.85x = 3,135.69 × 791.02
  4. Step 4: Simplify right side
    2,089.85x = 2,480,377.56
  5. Step 5: Solve for x
    x = 2,480,377.56/2,089.85
  6. Step 6: Final answer
    x = 1,186.87

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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.