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Finding the Fourth Proportional to 989.08, 1,481.52 and 641.38

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Solution

The fourth proportional to 989.08, 1,481.52 and 641.38 is: 960.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.08 : 1,481.52 = 641.38 : x
  2. Step 2: Convert to fraction form
    989.08/1,481.52 = 641.38/x
  3. Step 3: Cross multiply
    989.08x = 1,481.52 × 641.38
  4. Step 4: Simplify right side
    989.08x = 950,214.82
  5. Step 5: Solve for x
    x = 950,214.82/989.08
  6. Step 6: Final answer
    x = 960.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.