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Finding the Fourth Proportional to 18,819.84, 28,226.16 and 7,129.20

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Solution

The fourth proportional to 18,819.84, 28,226.16 and 7,129.20 is: 10,692.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,819.84 : 28,226.16 = 7,129.20 : x
  2. Step 2: Convert to fraction form
    18,819.84/28,226.16 = 7,129.20/x
  3. Step 3: Cross multiply
    18,819.84x = 28,226.16 × 7,129.20
  4. Step 4: Simplify right side
    18,819.84x = 201,229,939.87
  5. Step 5: Solve for x
    x = 201,229,939.87/18,819.84
  6. Step 6: Final answer
    x = 10,692.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.