Home / 21,299.60-29,388.20-13,229.57

Finding the Fourth Proportional to 21,299.60, 29,388.20 and 13,229.57

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Solution

The fourth proportional to 21,299.60, 29,388.20 and 13,229.57 is: 18,253.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,299.60 : 29,388.20 = 13,229.57 : x
  2. Step 2: Convert to fraction form
    21,299.60/29,388.20 = 13,229.57/x
  3. Step 3: Cross multiply
    21,299.60x = 29,388.20 × 13,229.57
  4. Step 4: Simplify right side
    21,299.60x = 388,793,035.99
  5. Step 5: Solve for x
    x = 388,793,035.99/21,299.60
  6. Step 6: Final answer
    x = 18,253.54

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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.