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Finding the Fourth Proportional to 28,157.78, 38,857.38 and 16,979.78

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Solution

The fourth proportional to 28,157.78, 38,857.38 and 16,979.78 is: 23,431.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,157.78 : 38,857.38 = 16,979.78 : x
  2. Step 2: Convert to fraction form
    28,157.78/38,857.38 = 16,979.78/x
  3. Step 3: Cross multiply
    28,157.78x = 38,857.38 × 16,979.78
  4. Step 4: Simplify right side
    28,157.78x = 659,789,763.78
  5. Step 5: Solve for x
    x = 659,789,763.78/28,157.78
  6. Step 6: Final answer
    x = 23,431.88

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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.