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Finding the Fourth Proportional to 1,268.61, 1,750.65 and 825.68

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Solution

The fourth proportional to 1,268.61, 1,750.65 and 825.68 is: 1,139.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.61 : 1,750.65 = 825.68 : x
  2. Step 2: Convert to fraction form
    1,268.61/1,750.65 = 825.68/x
  3. Step 3: Cross multiply
    1,268.61x = 1,750.65 × 825.68
  4. Step 4: Simplify right side
    1,268.61x = 1,445,476.69
  5. Step 5: Solve for x
    x = 1,445,476.69/1,268.61
  6. Step 6: Final answer
    x = 1,139.42

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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.