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Finding the Fourth Proportional to 1,992.87, 2,987.69 and 1,221.75

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Solution

The fourth proportional to 1,992.87, 2,987.69 and 1,221.75 is: 1,831.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.87 : 2,987.69 = 1,221.75 : x
  2. Step 2: Convert to fraction form
    1,992.87/2,987.69 = 1,221.75/x
  3. Step 3: Cross multiply
    1,992.87x = 2,987.69 × 1,221.75
  4. Step 4: Simplify right side
    1,992.87x = 3,650,204.15
  5. Step 5: Solve for x
    x = 3,650,204.15/1,992.87
  6. Step 6: Final answer
    x = 1,831.63

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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.