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Finding the Fourth Proportional to 2,669.08, 4,003.70 and 721.28

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Solution

The fourth proportional to 2,669.08, 4,003.70 and 721.28 is: 1,081.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,669.08 : 4,003.70 = 721.28 : x
  2. Step 2: Convert to fraction form
    2,669.08/4,003.70 = 721.28/x
  3. Step 3: Cross multiply
    2,669.08x = 4,003.70 × 721.28
  4. Step 4: Simplify right side
    2,669.08x = 2,887,788.74
  5. Step 5: Solve for x
    x = 2,887,788.74/2,669.08
  6. Step 6: Final answer
    x = 1,081.94

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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.