Home / 812,191.20-1,218,286.80-221,215.20

Finding the Fourth Proportional to 812,191.20, 1,218,286.80 and 221,215.20

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Solution

The fourth proportional to 812,191.20, 1,218,286.80 and 221,215.20 is: 331,822.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    812,191.20 : 1,218,286.80 = 221,215.20 : x
  2. Step 2: Convert to fraction form
    812,191.20/1,218,286.80 = 221,215.20/x
  3. Step 3: Cross multiply
    812,191.20x = 1,218,286.80 × 221,215.20
  4. Step 4: Simplify right side
    812,191.20x = 269,503,558,119.36
  5. Step 5: Solve for x
    x = 269,503,558,119.36/812,191.20
  6. Step 6: Final answer
    x = 331,822.80

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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.