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Finding the Fourth Proportional to 2,661.75, 3,992.64 and 713.91

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Solution

The fourth proportional to 2,661.75, 3,992.64 and 713.91 is: 1,070.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.75 : 3,992.64 = 713.91 : x
  2. Step 2: Convert to fraction form
    2,661.75/3,992.64 = 713.91/x
  3. Step 3: Cross multiply
    2,661.75x = 3,992.64 × 713.91
  4. Step 4: Simplify right side
    2,661.75x = 2,850,385.62
  5. Step 5: Solve for x
    x = 2,850,385.62/2,661.75
  6. Step 6: Final answer
    x = 1,070.87

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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.