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Finding the Fourth Proportional to 85,499.80, 128,249.70 and 38,843.80

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Solution

The fourth proportional to 85,499.80, 128,249.70 and 38,843.80 is: 58,265.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,499.80 : 128,249.70 = 38,843.80 : x
  2. Step 2: Convert to fraction form
    85,499.80/128,249.70 = 38,843.80/x
  3. Step 3: Cross multiply
    85,499.80x = 128,249.70 × 38,843.80
  4. Step 4: Simplify right side
    85,499.80x = 4,981,705,696.86
  5. Step 5: Solve for x
    x = 4,981,705,696.86/85,499.80
  6. Step 6: Final answer
    x = 58,265.70

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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.