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Finding the Fourth Proportional to 3,321.69, 4,978.79 and 1,472.57

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Solution

The fourth proportional to 3,321.69, 4,978.79 and 1,472.57 is: 2,207.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.69 : 4,978.79 = 1,472.57 : x
  2. Step 2: Convert to fraction form
    3,321.69/4,978.79 = 1,472.57/x
  3. Step 3: Cross multiply
    3,321.69x = 4,978.79 × 1,472.57
  4. Step 4: Simplify right side
    3,321.69x = 7,331,584.53
  5. Step 5: Solve for x
    x = 7,331,584.53/3,321.69
  6. Step 6: Final answer
    x = 2,207.19

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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.