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Finding the Fourth Proportional to 2,668.80, 4,003.40 and 721.02

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Solution

The fourth proportional to 2,668.80, 4,003.40 and 721.02 is: 1,081.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,668.80 : 4,003.40 = 721.02 : x
  2. Step 2: Convert to fraction form
    2,668.80/4,003.40 = 721.02/x
  3. Step 3: Cross multiply
    2,668.80x = 4,003.40 × 721.02
  4. Step 4: Simplify right side
    2,668.80x = 2,886,531.47
  5. Step 5: Solve for x
    x = 2,886,531.47/2,668.80
  6. Step 6: Final answer
    x = 1,081.58

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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.