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Finding the Fourth Proportional to 996.90, 1,375.74 and 554.84

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Solution

The fourth proportional to 996.90, 1,375.74 and 554.84 is: 765.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.90 : 1,375.74 = 554.84 : x
  2. Step 2: Convert to fraction form
    996.90/1,375.74 = 554.84/x
  3. Step 3: Cross multiply
    996.90x = 1,375.74 × 554.84
  4. Step 4: Simplify right side
    996.90x = 763,308.70
  5. Step 5: Solve for x
    x = 763,308.70/996.90
  6. Step 6: Final answer
    x = 765.68

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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.