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Finding the Fourth Proportional to 996.54, 1,374.93 and 681.18

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Solution

The fourth proportional to 996.54, 1,374.93 and 681.18 is: 939.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.54 : 1,374.93 = 681.18 : x
  2. Step 2: Convert to fraction form
    996.54/1,374.93 = 681.18/x
  3. Step 3: Cross multiply
    996.54x = 1,374.93 × 681.18
  4. Step 4: Simplify right side
    996.54x = 936,574.82
  5. Step 5: Solve for x
    x = 936,574.82/996.54
  6. Step 6: Final answer
    x = 939.83

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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.