Home / 685,771.20-1,028,656.80-212,452.80

Finding the Fourth Proportional to 685,771.20, 1,028,656.80 and 212,452.80

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Solution

The fourth proportional to 685,771.20, 1,028,656.80 and 212,452.80 is: 318,679.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,771.20 : 1,028,656.80 = 212,452.80 : x
  2. Step 2: Convert to fraction form
    685,771.20/1,028,656.80 = 212,452.80/x
  3. Step 3: Cross multiply
    685,771.20x = 1,028,656.80 × 212,452.80
  4. Step 4: Simplify right side
    685,771.20x = 218,541,017,399.04
  5. Step 5: Solve for x
    x = 218,541,017,399.04/685,771.20
  6. Step 6: Final answer
    x = 318,679.20

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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.