Home / 2,147.67-3,221.30-686.43

Finding the Fourth Proportional to 2,147.67, 3,221.30 and 686.43

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Solution

The fourth proportional to 2,147.67, 3,221.30 and 686.43 is: 1,029.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,147.67 : 3,221.30 = 686.43 : x
  2. Step 2: Convert to fraction form
    2,147.67/3,221.30 = 686.43/x
  3. Step 3: Cross multiply
    2,147.67x = 3,221.30 × 686.43
  4. Step 4: Simplify right side
    2,147.67x = 2,211,177.42
  5. Step 5: Solve for x
    x = 2,211,177.42/2,147.67
  6. Step 6: Final answer
    x = 1,029.57

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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.