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Finding the Fourth Proportional to 996.74, 1,375.49 and 554.68

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Solution

The fourth proportional to 996.74, 1,375.49 and 554.68 is: 765.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.74 : 1,375.49 = 554.68 : x
  2. Step 2: Convert to fraction form
    996.74/1,375.49 = 554.68/x
  3. Step 3: Cross multiply
    996.74x = 1,375.49 × 554.68
  4. Step 4: Simplify right side
    996.74x = 762,956.79
  5. Step 5: Solve for x
    x = 762,956.79/996.74
  6. Step 6: Final answer
    x = 765.45

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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.