Home / 13,982.40-20,971.20-5,212.80

Finding the Fourth Proportional to 13,982.40, 20,971.20 and 5,212.80

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Solution

The fourth proportional to 13,982.40, 20,971.20 and 5,212.80 is: 7,818.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,982.40 : 20,971.20 = 5,212.80 : x
  2. Step 2: Convert to fraction form
    13,982.40/20,971.20 = 5,212.80/x
  3. Step 3: Cross multiply
    13,982.40x = 20,971.20 × 5,212.80
  4. Step 4: Simplify right side
    13,982.40x = 109,318,671.36
  5. Step 5: Solve for x
    x = 109,318,671.36/13,982.40
  6. Step 6: Final answer
    x = 7,818.31

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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.