Home / 13,989.75-20,981.40-3,994.31

Finding the Fourth Proportional to 13,989.75, 20,981.40 and 3,994.31

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Solution

The fourth proportional to 13,989.75, 20,981.40 and 3,994.31 is: 5,990.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,989.75 : 20,981.40 = 3,994.31 : x
  2. Step 2: Convert to fraction form
    13,989.75/20,981.40 = 3,994.31/x
  3. Step 3: Cross multiply
    13,989.75x = 20,981.40 × 3,994.31
  4. Step 4: Simplify right side
    13,989.75x = 83,806,110.93
  5. Step 5: Solve for x
    x = 83,806,110.93/13,989.75
  6. Step 6: Final answer
    x = 5,990.54

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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.