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Finding the Fourth Proportional to 676.12, 1,013.46 and 386.92

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Solution

The fourth proportional to 676.12, 1,013.46 and 386.92 is: 579.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.12 : 1,013.46 = 386.92 : x
  2. Step 2: Convert to fraction form
    676.12/1,013.46 = 386.92/x
  3. Step 3: Cross multiply
    676.12x = 1,013.46 × 386.92
  4. Step 4: Simplify right side
    676.12x = 392,127.94
  5. Step 5: Solve for x
    x = 392,127.94/676.12
  6. Step 6: Final answer
    x = 579.97

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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.