Home / 1,243.40-1,868.70-1,221.80

Finding the Fourth Proportional to 1,243.40, 1,868.70 and 1,221.80

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Solution

The fourth proportional to 1,243.40, 1,868.70 and 1,221.80 is: 1,836.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.40 : 1,868.70 = 1,221.80 : x
  2. Step 2: Convert to fraction form
    1,243.40/1,868.70 = 1,221.80/x
  3. Step 3: Cross multiply
    1,243.40x = 1,868.70 × 1,221.80
  4. Step 4: Simplify right side
    1,243.40x = 2,283,177.66
  5. Step 5: Solve for x
    x = 2,283,177.66/1,243.40
  6. Step 6: Final answer
    x = 1,836.24

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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.