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Finding the Fourth Proportional to 1,378.26, 2,067.60 and 762.24

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Solution

The fourth proportional to 1,378.26, 2,067.60 and 762.24 is: 1,143.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.26 : 2,067.60 = 762.24 : x
  2. Step 2: Convert to fraction form
    1,378.26/2,067.60 = 762.24/x
  3. Step 3: Cross multiply
    1,378.26x = 2,067.60 × 762.24
  4. Step 4: Simplify right side
    1,378.26x = 1,576,007.42
  5. Step 5: Solve for x
    x = 1,576,007.42/1,378.26
  6. Step 6: Final answer
    x = 1,143.48

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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.