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Finding the Fourth Proportional to 2,087.90, 3,131.86 and 991.70

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Solution

The fourth proportional to 2,087.90, 3,131.86 and 991.70 is: 1,487.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,087.90 : 3,131.86 = 991.70 : x
  2. Step 2: Convert to fraction form
    2,087.90/3,131.86 = 991.70/x
  3. Step 3: Cross multiply
    2,087.90x = 3,131.86 × 991.70
  4. Step 4: Simplify right side
    2,087.90x = 3,105,865.56
  5. Step 5: Solve for x
    x = 3,105,865.56/2,087.90
  6. Step 6: Final answer
    x = 1,487.55

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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.