Home / 21,872.16-30,171.78-18,072.86

Finding the Fourth Proportional to 21,872.16, 30,171.78 and 18,072.86

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Solution

The fourth proportional to 21,872.16, 30,171.78 and 18,072.86 is: 24,930.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,872.16 : 30,171.78 = 18,072.86 : x
  2. Step 2: Convert to fraction form
    21,872.16/30,171.78 = 18,072.86/x
  3. Step 3: Cross multiply
    21,872.16x = 30,171.78 × 18,072.86
  4. Step 4: Simplify right side
    21,872.16x = 545,290,205.03
  5. Step 5: Solve for x
    x = 545,290,205.03/21,872.16
  6. Step 6: Final answer
    x = 24,930.79

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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.