Home / 3,987.42-5,981.67-1,389.75

Finding the Fourth Proportional to 3,987.42, 5,981.67 and 1,389.75

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Solution

The fourth proportional to 3,987.42, 5,981.67 and 1,389.75 is: 2,084.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987.42 : 5,981.67 = 1,389.75 : x
  2. Step 2: Convert to fraction form
    3,987.42/5,981.67 = 1,389.75/x
  3. Step 3: Cross multiply
    3,987.42x = 5,981.67 × 1,389.75
  4. Step 4: Simplify right side
    3,987.42x = 8,313,025.88
  5. Step 5: Solve for x
    x = 8,313,025.88/3,987.42
  6. Step 6: Final answer
    x = 2,084.81

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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.