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Finding the Fourth Proportional to 18,771.76, 25,910.79 and 10,819.28

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Solution

The fourth proportional to 18,771.76, 25,910.79 and 10,819.28 is: 14,933.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.76 : 25,910.79 = 10,819.28 : x
  2. Step 2: Convert to fraction form
    18,771.76/25,910.79 = 10,819.28/x
  3. Step 3: Cross multiply
    18,771.76x = 25,910.79 × 10,819.28
  4. Step 4: Simplify right side
    18,771.76x = 280,335,962.48
  5. Step 5: Solve for x
    x = 280,335,962.48/18,771.76
  6. Step 6: Final answer
    x = 14,933.92

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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.