Home / 2,172.66-2,998.28-1,288.56

Finding the Fourth Proportional to 2,172.66, 2,998.28 and 1,288.56

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Solution

The fourth proportional to 2,172.66, 2,998.28 and 1,288.56 is: 1,778.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,172.66 : 2,998.28 = 1,288.56 : x
  2. Step 2: Convert to fraction form
    2,172.66/2,998.28 = 1,288.56/x
  3. Step 3: Cross multiply
    2,172.66x = 2,998.28 × 1,288.56
  4. Step 4: Simplify right side
    2,172.66x = 3,863,463.68
  5. Step 5: Solve for x
    x = 3,863,463.68/2,172.66
  6. Step 6: Final answer
    x = 1,778.22

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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.