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Finding the Fourth Proportional to 18,709.88, 25,819.24 and 10,211.72

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Solution

The fourth proportional to 18,709.88, 25,819.24 and 10,211.72 is: 14,091.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,709.88 : 25,819.24 = 10,211.72 : x
  2. Step 2: Convert to fraction form
    18,709.88/25,819.24 = 10,211.72/x
  3. Step 3: Cross multiply
    18,709.88x = 25,819.24 × 10,211.72
  4. Step 4: Simplify right side
    18,709.88x = 263,658,849.49
  5. Step 5: Solve for x
    x = 263,658,849.49/18,709.88
  6. Step 6: Final answer
    x = 14,091.96

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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.