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Finding the Fourth Proportional to 997.95, 1,375.28 and 717.69

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Solution

The fourth proportional to 997.95, 1,375.28 and 717.69 is: 989.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.95 : 1,375.28 = 717.69 : x
  2. Step 2: Convert to fraction form
    997.95/1,375.28 = 717.69/x
  3. Step 3: Cross multiply
    997.95x = 1,375.28 × 717.69
  4. Step 4: Simplify right side
    997.95x = 987,028.96
  5. Step 5: Solve for x
    x = 987,028.96/997.95
  6. Step 6: Final answer
    x = 989.05

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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.