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Finding the Fourth Proportional to 1,645.90, 2,469.42 and 721.33

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Solution

The fourth proportional to 1,645.90, 2,469.42 and 721.33 is: 1,082.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.90 : 2,469.42 = 721.33 : x
  2. Step 2: Convert to fraction form
    1,645.90/2,469.42 = 721.33/x
  3. Step 3: Cross multiply
    1,645.90x = 2,469.42 × 721.33
  4. Step 4: Simplify right side
    1,645.90x = 1,781,272.90
  5. Step 5: Solve for x
    x = 1,781,272.90/1,645.90
  6. Step 6: Final answer
    x = 1,082.25

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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.