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Finding the Fourth Proportional to 989.48, 1,481.48 and 745.26

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Solution

The fourth proportional to 989.48, 1,481.48 and 745.26 is: 1,115.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.48 : 1,481.48 = 745.26 : x
  2. Step 2: Convert to fraction form
    989.48/1,481.48 = 745.26/x
  3. Step 3: Cross multiply
    989.48x = 1,481.48 × 745.26
  4. Step 4: Simplify right side
    989.48x = 1,104,084.06
  5. Step 5: Solve for x
    x = 1,104,084.06/989.48
  6. Step 6: Final answer
    x = 1,115.83

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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.