Home / 685,771.70-1,028,657.55-212,453.30

Finding the Fourth Proportional to 685,771.70, 1,028,657.55 and 212,453.30

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Solution

The fourth proportional to 685,771.70, 1,028,657.55 and 212,453.30 is: 318,679.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,771.70 : 1,028,657.55 = 212,453.30 : x
  2. Step 2: Convert to fraction form
    685,771.70/1,028,657.55 = 212,453.30/x
  3. Step 3: Cross multiply
    685,771.70x = 1,028,657.55 × 212,453.30
  4. Step 4: Simplify right side
    685,771.70x = 218,541,691,067.42
  5. Step 5: Solve for x
    x = 218,541,691,067.42/685,771.70
  6. Step 6: Final answer
    x = 318,679.95

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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.