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Finding the Fourth Proportional to 1,989.53, 2,980.87 and 1,371.03

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Solution

The fourth proportional to 1,989.53, 2,980.87 and 1,371.03 is: 2,054.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989.53 : 2,980.87 = 1,371.03 : x
  2. Step 2: Convert to fraction form
    1,989.53/2,980.87 = 1,371.03/x
  3. Step 3: Cross multiply
    1,989.53x = 2,980.87 × 1,371.03
  4. Step 4: Simplify right side
    1,989.53x = 4,086,847.59
  5. Step 5: Solve for x
    x = 4,086,847.59/1,989.53
  6. Step 6: Final answer
    x = 2,054.18

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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.