Home / 21,979.28-30,331.41-11,907.79

Finding the Fourth Proportional to 21,979.28, 30,331.41 and 11,907.79

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Solution

The fourth proportional to 21,979.28, 30,331.41 and 11,907.79 is: 16,432.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.28 : 30,331.41 = 11,907.79 : x
  2. Step 2: Convert to fraction form
    21,979.28/30,331.41 = 11,907.79/x
  3. Step 3: Cross multiply
    21,979.28x = 30,331.41 × 11,907.79
  4. Step 4: Simplify right side
    21,979.28x = 361,179,984.86
  5. Step 5: Solve for x
    x = 361,179,984.86/21,979.28
  6. Step 6: Final answer
    x = 16,432.75

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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.