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Finding the Fourth Proportional to 2,147.07, 3,220.91 and 685.73

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Solution

The fourth proportional to 2,147.07, 3,220.91 and 685.73 is: 1,028.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.07 : 3,220.91 = 685.73 : x
  2. Step 2: Convert to fraction form
    2,147.07/3,220.91 = 685.73/x
  3. Step 3: Cross multiply
    2,147.07x = 3,220.91 × 685.73
  4. Step 4: Simplify right side
    2,147.07x = 2,208,655.08
  5. Step 5: Solve for x
    x = 2,208,655.08/2,147.07
  6. Step 6: Final answer
    x = 1,028.68

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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.