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Finding the Fourth Proportional to 1,998.21, 2,998.19 and 1,072.69

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Solution

The fourth proportional to 1,998.21, 2,998.19 and 1,072.69 is: 1,609.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.21 : 2,998.19 = 1,072.69 : x
  2. Step 2: Convert to fraction form
    1,998.21/2,998.19 = 1,072.69/x
  3. Step 3: Cross multiply
    1,998.21x = 2,998.19 × 1,072.69
  4. Step 4: Simplify right side
    1,998.21x = 3,216,127.82
  5. Step 5: Solve for x
    x = 3,216,127.82/1,998.21
  6. Step 6: Final answer
    x = 1,609.50

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Double scale
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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.