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Finding the Fourth Proportional to 1,999.38, 2,759.10 and 1,115.22

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Solution

The fourth proportional to 1,999.38, 2,759.10 and 1,115.22 is: 1,538.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,999.38 : 2,759.10 = 1,115.22 : x
  2. Step 2: Convert to fraction form
    1,999.38/2,759.10 = 1,115.22/x
  3. Step 3: Cross multiply
    1,999.38x = 2,759.10 × 1,115.22
  4. Step 4: Simplify right side
    1,999.38x = 3,077,003.50
  5. Step 5: Solve for x
    x = 3,077,003.50/1,999.38
  6. Step 6: Final answer
    x = 1,538.98

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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.