Home / 15,321.62-21,143.13-8,515.33

Finding the Fourth Proportional to 15,321.62, 21,143.13 and 8,515.33

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Solution

The fourth proportional to 15,321.62, 21,143.13 and 8,515.33 is: 11,750.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,321.62 : 21,143.13 = 8,515.33 : x
  2. Step 2: Convert to fraction form
    15,321.62/21,143.13 = 8,515.33/x
  3. Step 3: Cross multiply
    15,321.62x = 21,143.13 × 8,515.33
  4. Step 4: Simplify right side
    15,321.62x = 180,040,644.39
  5. Step 5: Solve for x
    x = 180,040,644.39/15,321.62
  6. Step 6: Final answer
    x = 11,750.76

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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.