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Finding the Fourth Proportional to 997.18, 1,375.78 and 555

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Solution

The fourth proportional to 997.18, 1,375.78 and 555 is: 765.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.18 : 1,375.78 = 555 : x
  2. Step 2: Convert to fraction form
    997.18/1,375.78 = 555/x
  3. Step 3: Cross multiply
    997.18x = 1,375.78 × 555
  4. Step 4: Simplify right side
    997.18x = 763,557.90
  5. Step 5: Solve for x
    x = 763,557.90/997.18
  6. Step 6: Final answer
    x = 765.72

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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.