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Finding the Fourth Proportional to 3,991.43, 5,987.13 and 3,985.65

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Solution

The fourth proportional to 3,991.43, 5,987.13 and 3,985.65 is: 5,978.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,991.43 : 5,987.13 = 3,985.65 : x
  2. Step 2: Convert to fraction form
    3,991.43/5,987.13 = 3,985.65/x
  3. Step 3: Cross multiply
    3,991.43x = 5,987.13 × 3,985.65
  4. Step 4: Simplify right side
    3,991.43x = 23,862,604.68
  5. Step 5: Solve for x
    x = 23,862,604.68/3,991.43
  6. Step 6: Final answer
    x = 5,978.47

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1.5x scale

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.