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Finding the Fourth Proportional to 521,190.90, 781,786.35 and 320,861.70

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Solution

The fourth proportional to 521,190.90, 781,786.35 and 320,861.70 is: 481,292.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,190.90 : 781,786.35 = 320,861.70 : x
  2. Step 2: Convert to fraction form
    521,190.90/781,786.35 = 320,861.70/x
  3. Step 3: Cross multiply
    521,190.90x = 781,786.35 × 320,861.70
  4. Step 4: Simplify right side
    521,190.90x = 250,845,297,297.80
  5. Step 5: Solve for x
    x = 250,845,297,297.80/521,190.90
  6. Step 6: Final answer
    x = 481,292.55

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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.