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Finding the Fourth Proportional to 15,279, 21,080.28 and 8,563.69

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Solution

The fourth proportional to 15,279, 21,080.28 and 8,563.69 is: 11,815.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,279 : 21,080.28 = 8,563.69 : x
  2. Step 2: Convert to fraction form
    15,279/21,080.28 = 8,563.69/x
  3. Step 3: Cross multiply
    15,279x = 21,080.28 × 8,563.69
  4. Step 4: Simplify right side
    15,279x = 180,524,983.03
  5. Step 5: Solve for x
    x = 180,524,983.03/15,279
  6. Step 6: Final answer
    x = 11,815.24

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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.