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Finding the Fourth Proportional to 1,994.20, 2,991.30 and 762.18

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Solution

The fourth proportional to 1,994.20, 2,991.30 and 762.18 is: 1,143.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,994.20 : 2,991.30 = 762.18 : x
  2. Step 2: Convert to fraction form
    1,994.20/2,991.30 = 762.18/x
  3. Step 3: Cross multiply
    1,994.20x = 2,991.30 × 762.18
  4. Step 4: Simplify right side
    1,994.20x = 2,279,909.03
  5. Step 5: Solve for x
    x = 2,279,909.03/1,994.20
  6. Step 6: Final answer
    x = 1,143.27

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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.