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Finding the Fourth Proportional to 989.54, 1,481.57 and 745.32

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Solution

The fourth proportional to 989.54, 1,481.57 and 745.32 is: 1,115.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.54 : 1,481.57 = 745.32 : x
  2. Step 2: Convert to fraction form
    989.54/1,481.57 = 745.32/x
  3. Step 3: Cross multiply
    989.54x = 1,481.57 × 745.32
  4. Step 4: Simplify right side
    989.54x = 1,104,240.03
  5. Step 5: Solve for x
    x = 1,104,240.03/989.54
  6. Step 6: Final answer
    x = 1,115.92

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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.