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Finding the Fourth Proportional to 1,997.90, 2,755.58 and 1,211.12

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Solution

The fourth proportional to 1,997.90, 2,755.58 and 1,211.12 is: 1,670.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,997.90 : 2,755.58 = 1,211.12 : x
  2. Step 2: Convert to fraction form
    1,997.90/2,755.58 = 1,211.12/x
  3. Step 3: Cross multiply
    1,997.90x = 2,755.58 × 1,211.12
  4. Step 4: Simplify right side
    1,997.90x = 3,337,338.05
  5. Step 5: Solve for x
    x = 3,337,338.05/1,997.90
  6. Step 6: Final answer
    x = 1,670.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.