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Finding the Fourth Proportional to 1,645.80, 2,469.05 and 721.19

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Solution

The fourth proportional to 1,645.80, 2,469.05 and 721.19 is: 1,081.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.80 : 2,469.05 = 721.19 : x
  2. Step 2: Convert to fraction form
    1,645.80/2,469.05 = 721.19/x
  3. Step 3: Cross multiply
    1,645.80x = 2,469.05 × 721.19
  4. Step 4: Simplify right side
    1,645.80x = 1,780,638.22
  5. Step 5: Solve for x
    x = 1,780,638.22/1,645.80
  6. Step 6: Final answer
    x = 1,081.93

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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.