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Finding the Fourth Proportional to 1,998.81, 2,997.61 and 1,218.78

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Solution

The fourth proportional to 1,998.81, 2,997.61 and 1,218.78 is: 1,827.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.81 : 2,997.61 = 1,218.78 : x
  2. Step 2: Convert to fraction form
    1,998.81/2,997.61 = 1,218.78/x
  3. Step 3: Cross multiply
    1,998.81x = 2,997.61 × 1,218.78
  4. Step 4: Simplify right side
    1,998.81x = 3,653,424.07
  5. Step 5: Solve for x
    x = 3,653,424.07/1,998.81
  6. Step 6: Final answer
    x = 1,827.80

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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.