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Finding the Fourth Proportional to 1,243.28, 1,866.36 and 667.28

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Solution

The fourth proportional to 1,243.28, 1,866.36 and 667.28 is: 1,001.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.28 : 1,866.36 = 667.28 : x
  2. Step 2: Convert to fraction form
    1,243.28/1,866.36 = 667.28/x
  3. Step 3: Cross multiply
    1,243.28x = 1,866.36 × 667.28
  4. Step 4: Simplify right side
    1,243.28x = 1,245,384.70
  5. Step 5: Solve for x
    x = 1,245,384.70/1,243.28
  6. Step 6: Final answer
    x = 1,001.69

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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.