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Finding the Fourth Proportional to 15,855.87, 21,879.53 and 9,481.20

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Solution

The fourth proportional to 15,855.87, 21,879.53 and 9,481.20 is: 13,083.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,855.87 : 21,879.53 = 9,481.20 : x
  2. Step 2: Convert to fraction form
    15,855.87/21,879.53 = 9,481.20/x
  3. Step 3: Cross multiply
    15,855.87x = 21,879.53 × 9,481.20
  4. Step 4: Simplify right side
    15,855.87x = 207,444,105.94
  5. Step 5: Solve for x
    x = 207,444,105.94/15,855.87
  6. Step 6: Final answer
    x = 13,083.11

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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.