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Finding the Fourth Proportional to 676.78, 1,007.20 and 674.75

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Solution

The fourth proportional to 676.78, 1,007.20 and 674.75 is: 1,004.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.78 : 1,007.20 = 674.75 : x
  2. Step 2: Convert to fraction form
    676.78/1,007.20 = 674.75/x
  3. Step 3: Cross multiply
    676.78x = 1,007.20 × 674.75
  4. Step 4: Simplify right side
    676.78x = 679,608.20
  5. Step 5: Solve for x
    x = 679,608.20/676.78
  6. Step 6: Final answer
    x = 1,004.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.