Home / 13,981.40-20,969.70-5,211.80

Finding the Fourth Proportional to 13,981.40, 20,969.70 and 5,211.80

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Solution

The fourth proportional to 13,981.40, 20,969.70 and 5,211.80 is: 7,816.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.40 : 20,969.70 = 5,211.80 : x
  2. Step 2: Convert to fraction form
    13,981.40/20,969.70 = 5,211.80/x
  3. Step 3: Cross multiply
    13,981.40x = 20,969.70 × 5,211.80
  4. Step 4: Simplify right side
    13,981.40x = 109,289,882.46
  5. Step 5: Solve for x
    x = 109,289,882.46/13,981.40
  6. Step 6: Final answer
    x = 7,816.81

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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.