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Finding the Fourth Proportional to 1,299, 1,792.62 and 885

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Solution

The fourth proportional to 1,299, 1,792.62 and 885 is: 1,221.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299 : 1,792.62 = 885 : x
  2. Step 2: Convert to fraction form
    1,299/1,792.62 = 885/x
  3. Step 3: Cross multiply
    1,299x = 1,792.62 × 885
  4. Step 4: Simplify right side
    1,299x = 1,586,468.70
  5. Step 5: Solve for x
    x = 1,586,468.70/1,299
  6. Step 6: Final answer
    x = 1,221.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.