Home / 1,229.45-1,685.21-1,212.15

Finding the Fourth Proportional to 1,229.45, 1,685.21 and 1,212.15

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Solution

The fourth proportional to 1,229.45, 1,685.21 and 1,212.15 is: 1,661.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,229.45 : 1,685.21 = 1,212.15 : x
  2. Step 2: Convert to fraction form
    1,229.45/1,685.21 = 1,212.15/x
  3. Step 3: Cross multiply
    1,229.45x = 1,685.21 × 1,212.15
  4. Step 4: Simplify right side
    1,229.45x = 2,042,725.19
  5. Step 5: Solve for x
    x = 2,042,725.19/1,229.45
  6. Step 6: Final answer
    x = 1,661.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.