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Finding the Fourth Proportional to 676.73, 1,013.87 and 640.28

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Solution

The fourth proportional to 676.73, 1,013.87 and 640.28 is: 959.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.73 : 1,013.87 = 640.28 : x
  2. Step 2: Convert to fraction form
    676.73/1,013.87 = 640.28/x
  3. Step 3: Cross multiply
    676.73x = 1,013.87 × 640.28
  4. Step 4: Simplify right side
    676.73x = 649,157.21
  5. Step 5: Solve for x
    x = 649,157.21/676.73
  6. Step 6: Final answer
    x = 959.26

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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.