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Finding the Fourth Proportional to 1,994.58, 2,991.42 and 761.55

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Solution

The fourth proportional to 1,994.58, 2,991.42 and 761.55 is: 1,142.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,994.58 : 2,991.42 = 761.55 : x
  2. Step 2: Convert to fraction form
    1,994.58/2,991.42 = 761.55/x
  3. Step 3: Cross multiply
    1,994.58x = 2,991.42 × 761.55
  4. Step 4: Simplify right side
    1,994.58x = 2,278,115.90
  5. Step 5: Solve for x
    x = 2,278,115.90/1,994.58
  6. Step 6: Final answer
    x = 1,142.15

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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.