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Finding the Fourth Proportional to 1,555.11, 2,149.11 and 1,274.90

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Solution

The fourth proportional to 1,555.11, 2,149.11 and 1,274.90 is: 1,761.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.11 : 2,149.11 = 1,274.90 : x
  2. Step 2: Convert to fraction form
    1,555.11/2,149.11 = 1,274.90/x
  3. Step 3: Cross multiply
    1,555.11x = 2,149.11 × 1,274.90
  4. Step 4: Simplify right side
    1,555.11x = 2,739,889.59
  5. Step 5: Solve for x
    x = 2,739,889.59/1,555.11
  6. Step 6: Final answer
    x = 1,761.86

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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.