Home / 21,007.80-31,446.90-12,216.60

Finding the Fourth Proportional to 21,007.80, 31,446.90 and 12,216.60

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Solution

The fourth proportional to 21,007.80, 31,446.90 and 12,216.60 is: 18,287.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.80 : 31,446.90 = 12,216.60 : x
  2. Step 2: Convert to fraction form
    21,007.80/31,446.90 = 12,216.60/x
  3. Step 3: Cross multiply
    21,007.80x = 31,446.90 × 12,216.60
  4. Step 4: Simplify right side
    21,007.80x = 384,174,198.54
  5. Step 5: Solve for x
    x = 384,174,198.54/21,007.80
  6. Step 6: Final answer
    x = 18,287.22

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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.