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Finding the Fourth Proportional to 1,998.32, 2,755.23 and 1,643

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Solution

The fourth proportional to 1,998.32, 2,755.23 and 1,643 is: 2,265.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.32 : 2,755.23 = 1,643 : x
  2. Step 2: Convert to fraction form
    1,998.32/2,755.23 = 1,643/x
  3. Step 3: Cross multiply
    1,998.32x = 2,755.23 × 1,643
  4. Step 4: Simplify right side
    1,998.32x = 4,526,842.89
  5. Step 5: Solve for x
    x = 4,526,842.89/1,998.32
  6. Step 6: Final answer
    x = 2,265.32

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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.