Home / 20,988.25-28,957.27-11,912.13

Finding the Fourth Proportional to 20,988.25, 28,957.27 and 11,912.13

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Solution

The fourth proportional to 20,988.25, 28,957.27 and 11,912.13 is: 16,435.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.25 : 28,957.27 = 11,912.13 : x
  2. Step 2: Convert to fraction form
    20,988.25/28,957.27 = 11,912.13/x
  3. Step 3: Cross multiply
    20,988.25x = 28,957.27 × 11,912.13
  4. Step 4: Simplify right side
    20,988.25x = 344,942,649.68
  5. Step 5: Solve for x
    x = 344,942,649.68/20,988.25
  6. Step 6: Final answer
    x = 16,435.04

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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.