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Finding the Fourth Proportional to 20,209.88, 27,888.90 and 11,826.20

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Solution

The fourth proportional to 20,209.88, 27,888.90 and 11,826.20 is: 16,319.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,209.88 : 27,888.90 = 11,826.20 : x
  2. Step 2: Convert to fraction form
    20,209.88/27,888.90 = 11,826.20/x
  3. Step 3: Cross multiply
    20,209.88x = 27,888.90 × 11,826.20
  4. Step 4: Simplify right side
    20,209.88x = 329,819,709.18
  5. Step 5: Solve for x
    x = 329,819,709.18/20,209.88
  6. Step 6: Final answer
    x = 16,319.73

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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.