Home / 20,172.43-27,838.25-12,215.40

Finding the Fourth Proportional to 20,172.43, 27,838.25 and 12,215.40

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Solution

The fourth proportional to 20,172.43, 27,838.25 and 12,215.40 is: 16,857.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,172.43 : 27,838.25 = 12,215.40 : x
  2. Step 2: Convert to fraction form
    20,172.43/27,838.25 = 12,215.40/x
  3. Step 3: Cross multiply
    20,172.43x = 27,838.25 × 12,215.40
  4. Step 4: Simplify right side
    20,172.43x = 340,055,359.05
  5. Step 5: Solve for x
    x = 340,055,359.05/20,172.43
  6. Step 6: Final answer
    x = 16,857.43

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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.