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Finding the Fourth Proportional to 996.23, 1,374.95 and 717.39

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Solution

The fourth proportional to 996.23, 1,374.95 and 717.39 is: 990.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.23 : 1,374.95 = 717.39 : x
  2. Step 2: Convert to fraction form
    996.23/1,374.95 = 717.39/x
  3. Step 3: Cross multiply
    996.23x = 1,374.95 × 717.39
  4. Step 4: Simplify right side
    996.23x = 986,375.38
  5. Step 5: Solve for x
    x = 986,375.38/996.23
  6. Step 6: Final answer
    x = 990.11

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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.