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Finding the Fourth Proportional to 1,243.80, 1,801.69 and 1,243.80

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Solution

The fourth proportional to 1,243.80, 1,801.69 and 1,243.80 is: 1,801.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.80 : 1,801.69 = 1,243.80 : x
  2. Step 2: Convert to fraction form
    1,243.80/1,801.69 = 1,243.80/x
  3. Step 3: Cross multiply
    1,243.80x = 1,801.69 × 1,243.80
  4. Step 4: Simplify right side
    1,243.80x = 2,240,938.91
  5. Step 5: Solve for x
    x = 2,240,938.91/1,243.80
  6. Step 6: Final answer
    x = 1,801.69

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.