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Finding the Fourth Proportional to 1,268.76, 1,749.40 and 896.96

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Solution

The fourth proportional to 1,268.76, 1,749.40 and 896.96 is: 1,236.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.76 : 1,749.40 = 896.96 : x
  2. Step 2: Convert to fraction form
    1,268.76/1,749.40 = 896.96/x
  3. Step 3: Cross multiply
    1,268.76x = 1,749.40 × 896.96
  4. Step 4: Simplify right side
    1,268.76x = 1,569,141.82
  5. Step 5: Solve for x
    x = 1,569,141.82/1,268.76
  6. Step 6: Final answer
    x = 1,236.75

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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.