Home / 2,172.81-3,231.26-2,103.61

Finding the Fourth Proportional to 2,172.81, 3,231.26 and 2,103.61

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Solution

The fourth proportional to 2,172.81, 3,231.26 and 2,103.61 is: 3,128.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.81 : 3,231.26 = 2,103.61 : x
  2. Step 2: Convert to fraction form
    2,172.81/3,231.26 = 2,103.61/x
  3. Step 3: Cross multiply
    2,172.81x = 3,231.26 × 2,103.61
  4. Step 4: Simplify right side
    2,172.81x = 6,797,308.03
  5. Step 5: Solve for x
    x = 6,797,308.03/2,172.81
  6. Step 6: Final answer
    x = 3,128.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.