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Finding the Fourth Proportional to 996.61, 1,375.30 and 554.50

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Solution

The fourth proportional to 996.61, 1,375.30 and 554.50 is: 765.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.61 : 1,375.30 = 554.50 : x
  2. Step 2: Convert to fraction form
    996.61/1,375.30 = 554.50/x
  3. Step 3: Cross multiply
    996.61x = 1,375.30 × 554.50
  4. Step 4: Simplify right side
    996.61x = 762,603.85
  5. Step 5: Solve for x
    x = 762,603.85/996.61
  6. Step 6: Final answer
    x = 765.20

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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.