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Finding the Fourth Proportional to 996.43, 1,374.99 and 554.30

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Solution

The fourth proportional to 996.43, 1,374.99 and 554.30 is: 764.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.43 : 1,374.99 = 554.30 : x
  2. Step 2: Convert to fraction form
    996.43/1,374.99 = 554.30/x
  3. Step 3: Cross multiply
    996.43x = 1,374.99 × 554.30
  4. Step 4: Simplify right side
    996.43x = 762,156.96
  5. Step 5: Solve for x
    x = 762,156.96/996.43
  6. Step 6: Final answer
    x = 764.89

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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.