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Finding the Fourth Proportional to 1,261.22, 1,889.97 and 635.65

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Solution

The fourth proportional to 1,261.22, 1,889.97 and 635.65 is: 952.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.22 : 1,889.97 = 635.65 : x
  2. Step 2: Convert to fraction form
    1,261.22/1,889.97 = 635.65/x
  3. Step 3: Cross multiply
    1,261.22x = 1,889.97 × 635.65
  4. Step 4: Simplify right side
    1,261.22x = 1,201,359.43
  5. Step 5: Solve for x
    x = 1,201,359.43/1,261.22
  6. Step 6: Final answer
    x = 952.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.