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Finding the Fourth Proportional to 1,993.57, 2,987.11 and 1,172.59

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Solution

The fourth proportional to 1,993.57, 2,987.11 and 1,172.59 is: 1,756.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,993.57 : 2,987.11 = 1,172.59 : x
  2. Step 2: Convert to fraction form
    1,993.57/2,987.11 = 1,172.59/x
  3. Step 3: Cross multiply
    1,993.57x = 2,987.11 × 1,172.59
  4. Step 4: Simplify right side
    1,993.57x = 3,502,634.52
  5. Step 5: Solve for x
    x = 3,502,634.52/1,993.57
  6. Step 6: Final answer
    x = 1,756.97

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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.