Home / 21,022.80-31,469.40-12,231.60

Finding the Fourth Proportional to 21,022.80, 31,469.40 and 12,231.60

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Solution

The fourth proportional to 21,022.80, 31,469.40 and 12,231.60 is: 18,309.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,022.80 : 31,469.40 = 12,231.60 : x
  2. Step 2: Convert to fraction form
    21,022.80/31,469.40 = 12,231.60/x
  3. Step 3: Cross multiply
    21,022.80x = 31,469.40 × 12,231.60
  4. Step 4: Simplify right side
    21,022.80x = 384,921,113.04
  5. Step 5: Solve for x
    x = 384,921,113.04/21,022.80
  6. Step 6: Final answer
    x = 18,309.70

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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.