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Finding the Fourth Proportional to 1,998.70, 2,991.99 and 1,267.30

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Solution

The fourth proportional to 1,998.70, 2,991.99 and 1,267.30 is: 1,897.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.70 : 2,991.99 = 1,267.30 : x
  2. Step 2: Convert to fraction form
    1,998.70/2,991.99 = 1,267.30/x
  3. Step 3: Cross multiply
    1,998.70x = 2,991.99 × 1,267.30
  4. Step 4: Simplify right side
    1,998.70x = 3,791,748.93
  5. Step 5: Solve for x
    x = 3,791,748.93/1,998.70
  6. Step 6: Final answer
    x = 1,897.11

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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.