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Finding the Fourth Proportional to 3,992.40, 5,986.01 and 1,912.35

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Solution

The fourth proportional to 3,992.40, 5,986.01 and 1,912.35 is: 2,867.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,992.40 : 5,986.01 = 1,912.35 : x
  2. Step 2: Convert to fraction form
    3,992.40/5,986.01 = 1,912.35/x
  3. Step 3: Cross multiply
    3,992.40x = 5,986.01 × 1,912.35
  4. Step 4: Simplify right side
    3,992.40x = 11,447,336.66
  5. Step 5: Solve for x
    x = 11,447,336.66/3,992.40
  6. Step 6: Final answer
    x = 2,867.28

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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.