Home / 1,218.81-1,828.22-1,121.61

Finding the Fourth Proportional to 1,218.81, 1,828.22 and 1,121.61

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Solution

The fourth proportional to 1,218.81, 1,828.22 and 1,121.61 is: 1,682.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.81 : 1,828.22 = 1,121.61 : x
  2. Step 2: Convert to fraction form
    1,218.81/1,828.22 = 1,121.61/x
  3. Step 3: Cross multiply
    1,218.81x = 1,828.22 × 1,121.61
  4. Step 4: Simplify right side
    1,218.81x = 2,050,544.23
  5. Step 5: Solve for x
    x = 2,050,544.23/1,218.81
  6. Step 6: Final answer
    x = 1,682.42

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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.