Home / 2,172.12-3,258.45-711.78

Finding the Fourth Proportional to 2,172.12, 3,258.45 and 711.78

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Solution

The fourth proportional to 2,172.12, 3,258.45 and 711.78 is: 1,067.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.12 : 3,258.45 = 711.78 : x
  2. Step 2: Convert to fraction form
    2,172.12/3,258.45 = 711.78/x
  3. Step 3: Cross multiply
    2,172.12x = 3,258.45 × 711.78
  4. Step 4: Simplify right side
    2,172.12x = 2,319,299.54
  5. Step 5: Solve for x
    x = 2,319,299.54/2,172.12
  6. Step 6: Final answer
    x = 1,067.76

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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.