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Finding the Fourth Proportional to 1,991.05, 2,982.47 and 1,257.05

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Solution

The fourth proportional to 1,991.05, 2,982.47 and 1,257.05 is: 1,882.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.05 : 2,982.47 = 1,257.05 : x
  2. Step 2: Convert to fraction form
    1,991.05/2,982.47 = 1,257.05/x
  3. Step 3: Cross multiply
    1,991.05x = 2,982.47 × 1,257.05
  4. Step 4: Simplify right side
    1,991.05x = 3,749,115.08
  5. Step 5: Solve for x
    x = 3,749,115.08/1,991.05
  6. Step 6: Final answer
    x = 1,882.99

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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.