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Finding the Fourth Proportional to 521,738.70, 782,608.05 and 255,540.30

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Solution

The fourth proportional to 521,738.70, 782,608.05 and 255,540.30 is: 383,310.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,738.70 : 782,608.05 = 255,540.30 : x
  2. Step 2: Convert to fraction form
    521,738.70/782,608.05 = 255,540.30/x
  3. Step 3: Cross multiply
    521,738.70x = 782,608.05 × 255,540.30
  4. Step 4: Simplify right side
    521,738.70x = 199,987,895,879.42
  5. Step 5: Solve for x
    x = 199,987,895,879.42/521,738.70
  6. Step 6: Final answer
    x = 383,310.45

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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.