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Finding the Fourth Proportional to 3,986.74, 5,978.49 and 1,389.07

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Solution

The fourth proportional to 3,986.74, 5,978.49 and 1,389.07 is: 2,083.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.74 : 5,978.49 = 1,389.07 : x
  2. Step 2: Convert to fraction form
    3,986.74/5,978.49 = 1,389.07/x
  3. Step 3: Cross multiply
    3,986.74x = 5,978.49 × 1,389.07
  4. Step 4: Simplify right side
    3,986.74x = 8,304,541.10
  5. Step 5: Solve for x
    x = 8,304,541.10/3,986.74
  6. Step 6: Final answer
    x = 2,083.04

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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.