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Finding the Fourth Proportional to 1,991.40, 2,679.75 and 1,991.40

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Solution

The fourth proportional to 1,991.40, 2,679.75 and 1,991.40 is: 2,679.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.40 : 2,679.75 = 1,991.40 : x
  2. Step 2: Convert to fraction form
    1,991.40/2,679.75 = 1,991.40/x
  3. Step 3: Cross multiply
    1,991.40x = 2,679.75 × 1,991.40
  4. Step 4: Simplify right side
    1,991.40x = 5,336,454.15
  5. Step 5: Solve for x
    x = 5,336,454.15/1,991.40
  6. Step 6: Final answer
    x = 2,679.75

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.