Home / 21,180.78-29,229.48-13,222.98

Finding the Fourth Proportional to 21,180.78, 29,229.48 and 13,222.98

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Solution

The fourth proportional to 21,180.78, 29,229.48 and 13,222.98 is: 18,247.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,180.78 : 29,229.48 = 13,222.98 : x
  2. Step 2: Convert to fraction form
    21,180.78/29,229.48 = 13,222.98/x
  3. Step 3: Cross multiply
    21,180.78x = 29,229.48 × 13,222.98
  4. Step 4: Simplify right side
    21,180.78x = 386,500,829.45
  5. Step 5: Solve for x
    x = 386,500,829.45/21,180.78
  6. Step 6: Final answer
    x = 18,247.71

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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.