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Finding the Fourth Proportional to 1,991, 2,985.98 and 757.75

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Solution

The fourth proportional to 1,991, 2,985.98 and 757.75 is: 1,136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 2,985.98 = 757.75 : x
  2. Step 2: Convert to fraction form
    1,991/2,985.98 = 757.75/x
  3. Step 3: Cross multiply
    1,991x = 2,985.98 × 757.75
  4. Step 4: Simplify right side
    1,991x = 2,262,611.42
  5. Step 5: Solve for x
    x = 2,262,611.42/1,991
  6. Step 6: Final answer
    x = 1,136.42

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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.