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Finding the Fourth Proportional to 2,661.62, 3,992.41 and 687.08

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Solution

The fourth proportional to 2,661.62, 3,992.41 and 687.08 is: 1,030.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.62 : 3,992.41 = 687.08 : x
  2. Step 2: Convert to fraction form
    2,661.62/3,992.41 = 687.08/x
  3. Step 3: Cross multiply
    2,661.62x = 3,992.41 × 687.08
  4. Step 4: Simplify right side
    2,661.62x = 2,743,115.90
  5. Step 5: Solve for x
    x = 2,743,115.90/2,661.62
  6. Step 6: Final answer
    x = 1,030.62

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1.5x scale

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.