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Finding the Fourth Proportional to 1,994.85, 2,987.42 and 1,126.53

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Solution

The fourth proportional to 1,994.85, 2,987.42 and 1,126.53 is: 1,687.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,994.85 : 2,987.42 = 1,126.53 : x
  2. Step 2: Convert to fraction form
    1,994.85/2,987.42 = 1,126.53/x
  3. Step 3: Cross multiply
    1,994.85x = 2,987.42 × 1,126.53
  4. Step 4: Simplify right side
    1,994.85x = 3,365,412.62
  5. Step 5: Solve for x
    x = 3,365,412.62/1,994.85
  6. Step 6: Final answer
    x = 1,687.05

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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.