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Finding the Fourth Proportional to 253,857.72, 380,786.58 and 129,286.20

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Solution

The fourth proportional to 253,857.72, 380,786.58 and 129,286.20 is: 193,929.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    253,857.72 : 380,786.58 = 129,286.20 : x
  2. Step 2: Convert to fraction form
    253,857.72/380,786.58 = 129,286.20/x
  3. Step 3: Cross multiply
    253,857.72x = 380,786.58 × 129,286.20
  4. Step 4: Simplify right side
    253,857.72x = 49,230,449,939.20
  5. Step 5: Solve for x
    x = 49,230,449,939.20/253,857.72
  6. Step 6: Final answer
    x = 193,929.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.