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Finding the Fourth Proportional to 996.96, 1,374.40 and 717.12

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Solution

The fourth proportional to 996.96, 1,374.40 and 717.12 is: 988.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.96 : 1,374.40 = 717.12 : x
  2. Step 2: Convert to fraction form
    996.96/1,374.40 = 717.12/x
  3. Step 3: Cross multiply
    996.96x = 1,374.40 × 717.12
  4. Step 4: Simplify right side
    996.96x = 985,609.73
  5. Step 5: Solve for x
    x = 985,609.73/996.96
  6. Step 6: Final answer
    x = 988.62

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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.