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Finding the Fourth Proportional to 2,661.08, 3,991.74 and 713.30

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Solution

The fourth proportional to 2,661.08, 3,991.74 and 713.30 is: 1,069.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.08 : 3,991.74 = 713.30 : x
  2. Step 2: Convert to fraction form
    2,661.08/3,991.74 = 713.30/x
  3. Step 3: Cross multiply
    2,661.08x = 3,991.74 × 713.30
  4. Step 4: Simplify right side
    2,661.08x = 2,847,308.14
  5. Step 5: Solve for x
    x = 2,847,308.14/2,661.08
  6. Step 6: Final answer
    x = 1,069.98

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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.