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Finding the Fourth Proportional to 982.31, 1,474.49 and 722.61

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Solution

The fourth proportional to 982.31, 1,474.49 and 722.61 is: 1,084.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.31 : 1,474.49 = 722.61 : x
  2. Step 2: Convert to fraction form
    982.31/1,474.49 = 722.61/x
  3. Step 3: Cross multiply
    982.31x = 1,474.49 × 722.61
  4. Step 4: Simplify right side
    982.31x = 1,065,481.22
  5. Step 5: Solve for x
    x = 1,065,481.22/982.31
  6. Step 6: Final answer
    x = 1,084.67

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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.