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Finding the Fourth Proportional to 996.48, 1,374.66 and 665.04

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Solution

The fourth proportional to 996.48, 1,374.66 and 665.04 is: 917.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.48 : 1,374.66 = 665.04 : x
  2. Step 2: Convert to fraction form
    996.48/1,374.66 = 665.04/x
  3. Step 3: Cross multiply
    996.48x = 1,374.66 × 665.04
  4. Step 4: Simplify right side
    996.48x = 914,203.89
  5. Step 5: Solve for x
    x = 914,203.89/996.48
  6. Step 6: Final answer
    x = 917.43

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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.