Home / 1,991.38-2,986.19-1,066.78

Finding the Fourth Proportional to 1,991.38, 2,986.19 and 1,066.78

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Solution

The fourth proportional to 1,991.38, 2,986.19 and 1,066.78 is: 1,599.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.38 : 2,986.19 = 1,066.78 : x
  2. Step 2: Convert to fraction form
    1,991.38/2,986.19 = 1,066.78/x
  3. Step 3: Cross multiply
    1,991.38x = 2,986.19 × 1,066.78
  4. Step 4: Simplify right side
    1,991.38x = 3,185,607.77
  5. Step 5: Solve for x
    x = 3,185,607.77/1,991.38
  6. Step 6: Final answer
    x = 1,599.70

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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.