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Finding the Fourth Proportional to 3,991.78, 5,987.68 and 1,394.72

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Solution

The fourth proportional to 3,991.78, 5,987.68 and 1,394.72 is: 2,092.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.78 : 5,987.68 = 1,394.72 : x
  2. Step 2: Convert to fraction form
    3,991.78/5,987.68 = 1,394.72/x
  3. Step 3: Cross multiply
    3,991.78x = 5,987.68 × 1,394.72
  4. Step 4: Simplify right side
    3,991.78x = 8,351,137.05
  5. Step 5: Solve for x
    x = 8,351,137.05/3,991.78
  6. Step 6: Final answer
    x = 2,092.08

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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.