Home / 2,172.74-2,998.38-1,288.71

Finding the Fourth Proportional to 2,172.74, 2,998.38 and 1,288.71

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Solution

The fourth proportional to 2,172.74, 2,998.38 and 1,288.71 is: 1,778.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.74 : 2,998.38 = 1,288.71 : x
  2. Step 2: Convert to fraction form
    2,172.74/2,998.38 = 1,288.71/x
  3. Step 3: Cross multiply
    2,172.74x = 2,998.38 × 1,288.71
  4. Step 4: Simplify right side
    2,172.74x = 3,864,027.30
  5. Step 5: Solve for x
    x = 3,864,027.30/2,172.74
  6. Step 6: Final answer
    x = 1,778.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.