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Finding the Fourth Proportional to 3,991.87, 5,987.84 and 1,218.97

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Solution

The fourth proportional to 3,991.87, 5,987.84 and 1,218.97 is: 1,828.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.87 : 5,987.84 = 1,218.97 : x
  2. Step 2: Convert to fraction form
    3,991.87/5,987.84 = 1,218.97/x
  3. Step 3: Cross multiply
    3,991.87x = 5,987.84 × 1,218.97
  4. Step 4: Simplify right side
    3,991.87x = 7,298,991.23
  5. Step 5: Solve for x
    x = 7,298,991.23/3,991.87
  6. Step 6: Final answer
    x = 1,828.46

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Similar ratio
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1.5x scale

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.