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Finding the Fourth Proportional to 2,668.31, 4,002.56 and 720.56

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Solution

The fourth proportional to 2,668.31, 4,002.56 and 720.56 is: 1,080.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,668.31 : 4,002.56 = 720.56 : x
  2. Step 2: Convert to fraction form
    2,668.31/4,002.56 = 720.56/x
  3. Step 3: Cross multiply
    2,668.31x = 4,002.56 × 720.56
  4. Step 4: Simplify right side
    2,668.31x = 2,884,081.03
  5. Step 5: Solve for x
    x = 2,884,081.03/2,668.31
  6. Step 6: Final answer
    x = 1,080.86

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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.