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Finding the Fourth Proportional to 996.34, 1,375.42 and 664.98

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Solution

The fourth proportional to 996.34, 1,375.42 and 664.98 is: 917.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.34 : 1,375.42 = 664.98 : x
  2. Step 2: Convert to fraction form
    996.34/1,375.42 = 664.98/x
  3. Step 3: Cross multiply
    996.34x = 1,375.42 × 664.98
  4. Step 4: Simplify right side
    996.34x = 914,631.89
  5. Step 5: Solve for x
    x = 914,631.89/996.34
  6. Step 6: Final answer
    x = 917.99

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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.