Home / 1,212.09-1,816.72-664.73

Finding the Fourth Proportional to 1,212.09, 1,816.72 and 664.73

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Solution

The fourth proportional to 1,212.09, 1,816.72 and 664.73 is: 996.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.09 : 1,816.72 = 664.73 : x
  2. Step 2: Convert to fraction form
    1,212.09/1,816.72 = 664.73/x
  3. Step 3: Cross multiply
    1,212.09x = 1,816.72 × 664.73
  4. Step 4: Simplify right side
    1,212.09x = 1,207,628.29
  5. Step 5: Solve for x
    x = 1,207,628.29/1,212.09
  6. Step 6: Final answer
    x = 996.32

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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.