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Finding the Fourth Proportional to 732.78, 1,008.09 and 712.28

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Solution

The fourth proportional to 732.78, 1,008.09 and 712.28 is: 979.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    732.78 : 1,008.09 = 712.28 : x
  2. Step 2: Convert to fraction form
    732.78/1,008.09 = 712.28/x
  3. Step 3: Cross multiply
    732.78x = 1,008.09 × 712.28
  4. Step 4: Simplify right side
    732.78x = 718,042.35
  5. Step 5: Solve for x
    x = 718,042.35/732.78
  6. Step 6: Final answer
    x = 979.89

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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.