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Finding the Fourth Proportional to 1,372.77, 1,891.46 and 1,147.92

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Solution

The fourth proportional to 1,372.77, 1,891.46 and 1,147.92 is: 1,581.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.77 : 1,891.46 = 1,147.92 : x
  2. Step 2: Convert to fraction form
    1,372.77/1,891.46 = 1,147.92/x
  3. Step 3: Cross multiply
    1,372.77x = 1,891.46 × 1,147.92
  4. Step 4: Simplify right side
    1,372.77x = 2,171,239.02
  5. Step 5: Solve for x
    x = 2,171,239.02/1,372.77
  6. Step 6: Final answer
    x = 1,581.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.