Home / 15,765.78-21,755.16-9,049.80

Finding the Fourth Proportional to 15,765.78, 21,755.16 and 9,049.80

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Solution

The fourth proportional to 15,765.78, 21,755.16 and 9,049.80 is: 12,487.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,765.78 : 21,755.16 = 9,049.80 : x
  2. Step 2: Convert to fraction form
    15,765.78/21,755.16 = 9,049.80/x
  3. Step 3: Cross multiply
    15,765.78x = 21,755.16 × 9,049.80
  4. Step 4: Simplify right side
    15,765.78x = 196,879,846.97
  5. Step 5: Solve for x
    x = 196,879,846.97/15,765.78
  6. Step 6: Final answer
    x = 12,487.80

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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.