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Finding the Fourth Proportional to 676.80, 934.11 and 397.20

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Solution

The fourth proportional to 676.80, 934.11 and 397.20 is: 548.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.80 : 934.11 = 397.20 : x
  2. Step 2: Convert to fraction form
    676.80/934.11 = 397.20/x
  3. Step 3: Cross multiply
    676.80x = 934.11 × 397.20
  4. Step 4: Simplify right side
    676.80x = 371,028.49
  5. Step 5: Solve for x
    x = 371,028.49/676.80
  6. Step 6: Final answer
    x = 548.21

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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.