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Finding the Fourth Proportional to 1,645.88, 2,469.60 and 672.80

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Solution

The fourth proportional to 1,645.88, 2,469.60 and 672.80 is: 1,009.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,645.88 : 2,469.60 = 672.80 : x
  2. Step 2: Convert to fraction form
    1,645.88/2,469.60 = 672.80/x
  3. Step 3: Cross multiply
    1,645.88x = 2,469.60 × 672.80
  4. Step 4: Simplify right side
    1,645.88x = 1,661,546.88
  5. Step 5: Solve for x
    x = 1,661,546.88/1,645.88
  6. Step 6: Final answer
    x = 1,009.52

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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.