Home / 1,991.21-2,747.15-1,369.13

Finding the Fourth Proportional to 1,991.21, 2,747.15 and 1,369.13

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Solution

The fourth proportional to 1,991.21, 2,747.15 and 1,369.13 is: 1,888.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.21 : 2,747.15 = 1,369.13 : x
  2. Step 2: Convert to fraction form
    1,991.21/2,747.15 = 1,369.13/x
  3. Step 3: Cross multiply
    1,991.21x = 2,747.15 × 1,369.13
  4. Step 4: Simplify right side
    1,991.21x = 3,761,191.74
  5. Step 5: Solve for x
    x = 3,761,191.74/1,991.21
  6. Step 6: Final answer
    x = 1,888.90

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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.