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Finding the Fourth Proportional to 729.57, 1,006.36 and 680.97

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Solution

The fourth proportional to 729.57, 1,006.36 and 680.97 is: 939.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    729.57 : 1,006.36 = 680.97 : x
  2. Step 2: Convert to fraction form
    729.57/1,006.36 = 680.97/x
  3. Step 3: Cross multiply
    729.57x = 1,006.36 × 680.97
  4. Step 4: Simplify right side
    729.57x = 685,300.97
  5. Step 5: Solve for x
    x = 685,300.97/729.57
  6. Step 6: Final answer
    x = 939.32

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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.