Home / 21,979.16-30,331.20-11,907.85

Finding the Fourth Proportional to 21,979.16, 30,331.20 and 11,907.85

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Solution

The fourth proportional to 21,979.16, 30,331.20 and 11,907.85 is: 16,432.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.16 : 30,331.20 = 11,907.85 : x
  2. Step 2: Convert to fraction form
    21,979.16/30,331.20 = 11,907.85/x
  3. Step 3: Cross multiply
    21,979.16x = 30,331.20 × 11,907.85
  4. Step 4: Simplify right side
    21,979.16x = 361,179,373.18
  5. Step 5: Solve for x
    x = 361,179,373.18/21,979.16
  6. Step 6: Final answer
    x = 16,432.81

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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.