Home / 13,981.20-20,964.60-5,211.60

Finding the Fourth Proportional to 13,981.20, 20,964.60 and 5,211.60

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Solution

The fourth proportional to 13,981.20, 20,964.60 and 5,211.60 is: 7,814.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.20 : 20,964.60 = 5,211.60 : x
  2. Step 2: Convert to fraction form
    13,981.20/20,964.60 = 5,211.60/x
  3. Step 3: Cross multiply
    13,981.20x = 20,964.60 × 5,211.60
  4. Step 4: Simplify right side
    13,981.20x = 109,259,109.36
  5. Step 5: Solve for x
    x = 109,259,109.36/13,981.20
  6. Step 6: Final answer
    x = 7,814.72

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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.