Home / 21,324.60-31,922.10-18,991.80

Finding the Fourth Proportional to 21,324.60, 31,922.10 and 18,991.80

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Solution

The fourth proportional to 21,324.60, 31,922.10 and 18,991.80 is: 28,429.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,324.60 : 31,922.10 = 18,991.80 : x
  2. Step 2: Convert to fraction form
    21,324.60/31,922.10 = 18,991.80/x
  3. Step 3: Cross multiply
    21,324.60x = 31,922.10 × 18,991.80
  4. Step 4: Simplify right side
    21,324.60x = 606,258,138.78
  5. Step 5: Solve for x
    x = 606,258,138.78/21,324.60
  6. Step 6: Final answer
    x = 28,429.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.