Home / 13,990.20-20,981.84-8,722.50

Finding the Fourth Proportional to 13,990.20, 20,981.84 and 8,722.50

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Solution

The fourth proportional to 13,990.20, 20,981.84 and 8,722.50 is: 13,081.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.20 : 20,981.84 = 8,722.50 : x
  2. Step 2: Convert to fraction form
    13,990.20/20,981.84 = 8,722.50/x
  3. Step 3: Cross multiply
    13,990.20x = 20,981.84 × 8,722.50
  4. Step 4: Simplify right side
    13,990.20x = 183,014,121.21
  5. Step 5: Solve for x
    x = 183,014,121.21/13,990.20
  6. Step 6: Final answer
    x = 13,081.59

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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.