Home / 685,791.40-1,028,687.10-212,621.80

Finding the Fourth Proportional to 685,791.40, 1,028,687.10 and 212,621.80

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Solution

The fourth proportional to 685,791.40, 1,028,687.10 and 212,621.80 is: 318,932.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,791.40 : 1,028,687.10 = 212,621.80 : x
  2. Step 2: Convert to fraction form
    685,791.40/1,028,687.10 = 212,621.80/x
  3. Step 3: Cross multiply
    685,791.40x = 1,028,687.10 × 212,621.80
  4. Step 4: Simplify right side
    685,791.40x = 218,721,302,838.78
  5. Step 5: Solve for x
    x = 218,721,302,838.78/685,791.40
  6. Step 6: Final answer
    x = 318,932.70

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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.