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Finding the Fourth Proportional to 1,268.48, 1,750.79 and 825.61

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Solution

The fourth proportional to 1,268.48, 1,750.79 and 825.61 is: 1,139.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.48 : 1,750.79 = 825.61 : x
  2. Step 2: Convert to fraction form
    1,268.48/1,750.79 = 825.61/x
  3. Step 3: Cross multiply
    1,268.48x = 1,750.79 × 825.61
  4. Step 4: Simplify right side
    1,268.48x = 1,445,469.73
  5. Step 5: Solve for x
    x = 1,445,469.73/1,268.48
  6. Step 6: Final answer
    x = 1,139.53

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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.