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Finding the Fourth Proportional to 1,991.87, 2,747.64 and 1,653.86

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Solution

The fourth proportional to 1,991.87, 2,747.64 and 1,653.86 is: 2,281.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.87 : 2,747.64 = 1,653.86 : x
  2. Step 2: Convert to fraction form
    1,991.87/2,747.64 = 1,653.86/x
  3. Step 3: Cross multiply
    1,991.87x = 2,747.64 × 1,653.86
  4. Step 4: Simplify right side
    1,991.87x = 4,544,211.89
  5. Step 5: Solve for x
    x = 4,544,211.89/1,991.87
  6. Step 6: Final answer
    x = 2,281.38

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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.