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Finding the Fourth Proportional to 18,910.10, 28,356.78 and 7,215.14

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Solution

The fourth proportional to 18,910.10, 28,356.78 and 7,215.14 is: 10,819.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,910.10 : 28,356.78 = 7,215.14 : x
  2. Step 2: Convert to fraction form
    18,910.10/28,356.78 = 7,215.14/x
  3. Step 3: Cross multiply
    18,910.10x = 28,356.78 × 7,215.14
  4. Step 4: Simplify right side
    18,910.10x = 204,598,137.65
  5. Step 5: Solve for x
    x = 204,598,137.65/18,910.10
  6. Step 6: Final answer
    x = 10,819.52

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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.