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Finding the Fourth Proportional to 997.14, 1,375.80 and 624.30

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Solution

The fourth proportional to 997.14, 1,375.80 and 624.30 is: 861.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.14 : 1,375.80 = 624.30 : x
  2. Step 2: Convert to fraction form
    997.14/1,375.80 = 624.30/x
  3. Step 3: Cross multiply
    997.14x = 1,375.80 × 624.30
  4. Step 4: Simplify right side
    997.14x = 858,911.94
  5. Step 5: Solve for x
    x = 858,911.94/997.14
  6. Step 6: Final answer
    x = 861.38

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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.