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Finding the Fourth Proportional to 996.56, 1,376.36 and 990.16

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Solution

The fourth proportional to 996.56, 1,376.36 and 990.16 is: 1,367.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.56 : 1,376.36 = 990.16 : x
  2. Step 2: Convert to fraction form
    996.56/1,376.36 = 990.16/x
  3. Step 3: Cross multiply
    996.56x = 1,376.36 × 990.16
  4. Step 4: Simplify right side
    996.56x = 1,362,816.62
  5. Step 5: Solve for x
    x = 1,362,816.62/996.56
  6. Step 6: Final answer
    x = 1,367.52

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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.