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Finding the Fourth Proportional to 1,426.47, 2,138.07 and 767.57

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Solution

The fourth proportional to 1,426.47, 2,138.07 and 767.57 is: 1,150.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,426.47 : 2,138.07 = 767.57 : x
  2. Step 2: Convert to fraction form
    1,426.47/2,138.07 = 767.57/x
  3. Step 3: Cross multiply
    1,426.47x = 2,138.07 × 767.57
  4. Step 4: Simplify right side
    1,426.47x = 1,641,118.39
  5. Step 5: Solve for x
    x = 1,641,118.39/1,426.47
  6. Step 6: Final answer
    x = 1,150.48

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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.