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Finding the Fourth Proportional to 1,991.93, 2,987.89 and 531.23

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Solution

The fourth proportional to 1,991.93, 2,987.89 and 531.23 is: 796.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.93 : 2,987.89 = 531.23 : x
  2. Step 2: Convert to fraction form
    1,991.93/2,987.89 = 531.23/x
  3. Step 3: Cross multiply
    1,991.93x = 2,987.89 × 531.23
  4. Step 4: Simplify right side
    1,991.93x = 1,587,240.54
  5. Step 5: Solve for x
    x = 1,587,240.54/1,991.93
  6. Step 6: Final answer
    x = 796.84

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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.