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Finding the Fourth Proportional to 2,668.56, 4,002.48 and 720.92

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Solution

The fourth proportional to 2,668.56, 4,002.48 and 720.92 is: 1,081.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,668.56 : 4,002.48 = 720.92 : x
  2. Step 2: Convert to fraction form
    2,668.56/4,002.48 = 720.92/x
  3. Step 3: Cross multiply
    2,668.56x = 4,002.48 × 720.92
  4. Step 4: Simplify right side
    2,668.56x = 2,885,467.88
  5. Step 5: Solve for x
    x = 2,885,467.88/2,668.56
  6. Step 6: Final answer
    x = 1,081.28

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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.