Home / 13,981.30-20,971.90-4,120.56

Finding the Fourth Proportional to 13,981.30, 20,971.90 and 4,120.56

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Solution

The fourth proportional to 13,981.30, 20,971.90 and 4,120.56 is: 6,180.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,981.30 : 20,971.90 = 4,120.56 : x
  2. Step 2: Convert to fraction form
    13,981.30/20,971.90 = 4,120.56/x
  3. Step 3: Cross multiply
    13,981.30x = 20,971.90 × 4,120.56
  4. Step 4: Simplify right side
    13,981.30x = 86,415,972.26
  5. Step 5: Solve for x
    x = 86,415,972.26/13,981.30
  6. Step 6: Final answer
    x = 6,180.83

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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.