Home / 20,160.88-27,808.20-12,189.28

Finding the Fourth Proportional to 20,160.88, 27,808.20 and 12,189.28

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Solution

The fourth proportional to 20,160.88, 27,808.20 and 12,189.28 is: 16,812.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,160.88 : 27,808.20 = 12,189.28 : x
  2. Step 2: Convert to fraction form
    20,160.88/27,808.20 = 12,189.28/x
  3. Step 3: Cross multiply
    20,160.88x = 27,808.20 × 12,189.28
  4. Step 4: Simplify right side
    20,160.88x = 338,961,936.10
  5. Step 5: Solve for x
    x = 338,961,936.10/20,160.88
  6. Step 6: Final answer
    x = 16,812.85

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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.