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Finding the Fourth Proportional to 1,991.26, 2,987.10 and 674.98

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Solution

The fourth proportional to 1,991.26, 2,987.10 and 674.98 is: 1,012.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.26 : 2,987.10 = 674.98 : x
  2. Step 2: Convert to fraction form
    1,991.26/2,987.10 = 674.98/x
  3. Step 3: Cross multiply
    1,991.26x = 2,987.10 × 674.98
  4. Step 4: Simplify right side
    1,991.26x = 2,016,232.76
  5. Step 5: Solve for x
    x = 2,016,232.76/1,991.26
  6. Step 6: Final answer
    x = 1,012.54

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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.