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Finding the Fourth Proportional to 2,320.87, 3,481.67 and 781.75

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Solution

The fourth proportional to 2,320.87, 3,481.67 and 781.75 is: 1,172.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,320.87 : 3,481.67 = 781.75 : x
  2. Step 2: Convert to fraction form
    2,320.87/3,481.67 = 781.75/x
  3. Step 3: Cross multiply
    2,320.87x = 3,481.67 × 781.75
  4. Step 4: Simplify right side
    2,320.87x = 2,721,795.52
  5. Step 5: Solve for x
    x = 2,721,795.52/2,320.87
  6. Step 6: Final answer
    x = 1,172.75

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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.