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Finding the Fourth Proportional to 1,999.72, 2,999.58 and 1,121.79

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Solution

The fourth proportional to 1,999.72, 2,999.58 and 1,121.79 is: 1,682.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.72 : 2,999.58 = 1,121.79 : x
  2. Step 2: Convert to fraction form
    1,999.72/2,999.58 = 1,121.79/x
  3. Step 3: Cross multiply
    1,999.72x = 2,999.58 × 1,121.79
  4. Step 4: Simplify right side
    1,999.72x = 3,364,898.85
  5. Step 5: Solve for x
    x = 3,364,898.85/1,999.72
  6. Step 6: Final answer
    x = 1,682.69

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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.