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Finding the Fourth Proportional to 1,991.49, 2,987.69 and 758.87

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Solution

The fourth proportional to 1,991.49, 2,987.69 and 758.87 is: 1,138.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.49 : 2,987.69 = 758.87 : x
  2. Step 2: Convert to fraction form
    1,991.49/2,987.69 = 758.87/x
  3. Step 3: Cross multiply
    1,991.49x = 2,987.69 × 758.87
  4. Step 4: Simplify right side
    1,991.49x = 2,267,260.78
  5. Step 5: Solve for x
    x = 2,267,260.78/1,991.49
  6. Step 6: Final answer
    x = 1,138.48

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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.