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Finding the Fourth Proportional to 1,115.82, 1,540.26 and 742.59

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Solution

The fourth proportional to 1,115.82, 1,540.26 and 742.59 is: 1,025.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.82 : 1,540.26 = 742.59 : x
  2. Step 2: Convert to fraction form
    1,115.82/1,540.26 = 742.59/x
  3. Step 3: Cross multiply
    1,115.82x = 1,540.26 × 742.59
  4. Step 4: Simplify right side
    1,115.82x = 1,143,781.67
  5. Step 5: Solve for x
    x = 1,143,781.67/1,115.82
  6. Step 6: Final answer
    x = 1,025.06

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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.