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Finding the Fourth Proportional to 1,993.85, 2,991.53 and 761.54

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Solution

The fourth proportional to 1,993.85, 2,991.53 and 761.54 is: 1,142.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.85 : 2,991.53 = 761.54 : x
  2. Step 2: Convert to fraction form
    1,993.85/2,991.53 = 761.54/x
  3. Step 3: Cross multiply
    1,993.85x = 2,991.53 × 761.54
  4. Step 4: Simplify right side
    1,993.85x = 2,278,156.70
  5. Step 5: Solve for x
    x = 2,278,156.70/1,993.85
  6. Step 6: Final answer
    x = 1,142.59

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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.