Home / 20,172.90-27,839.82-12,215.86

Finding the Fourth Proportional to 20,172.90, 27,839.82 and 12,215.86

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Solution

The fourth proportional to 20,172.90, 27,839.82 and 12,215.86 is: 16,858.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,172.90 : 27,839.82 = 12,215.86 : x
  2. Step 2: Convert to fraction form
    20,172.90/27,839.82 = 12,215.86/x
  3. Step 3: Cross multiply
    20,172.90x = 27,839.82 × 12,215.86
  4. Step 4: Simplify right side
    20,172.90x = 340,087,343.55
  5. Step 5: Solve for x
    x = 340,087,343.55/20,172.90
  6. Step 6: Final answer
    x = 16,858.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.