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Finding the Fourth Proportional to 996.60, 1,375.26 and 642.03

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Solution

The fourth proportional to 996.60, 1,375.26 and 642.03 is: 885.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    996.60 : 1,375.26 = 642.03 : x
  2. Step 2: Convert to fraction form
    996.60/1,375.26 = 642.03/x
  3. Step 3: Cross multiply
    996.60x = 1,375.26 × 642.03
  4. Step 4: Simplify right side
    996.60x = 882,958.18
  5. Step 5: Solve for x
    x = 882,958.18/996.60
  6. Step 6: Final answer
    x = 885.97

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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.