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Finding the Fourth Proportional to 1,998.45, 2,997.56 and 611.77

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Solution

The fourth proportional to 1,998.45, 2,997.56 and 611.77 is: 917.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.45 : 2,997.56 = 611.77 : x
  2. Step 2: Convert to fraction form
    1,998.45/2,997.56 = 611.77/x
  3. Step 3: Cross multiply
    1,998.45x = 2,997.56 × 611.77
  4. Step 4: Simplify right side
    1,998.45x = 1,833,814.22
  5. Step 5: Solve for x
    x = 1,833,814.22/1,998.45
  6. Step 6: Final answer
    x = 917.62

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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.