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Finding the Fourth Proportional to 1,268.64, 1,902.96 and 748.56

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Solution

The fourth proportional to 1,268.64, 1,902.96 and 748.56 is: 1,122.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.64 : 1,902.96 = 748.56 : x
  2. Step 2: Convert to fraction form
    1,268.64/1,902.96 = 748.56/x
  3. Step 3: Cross multiply
    1,268.64x = 1,902.96 × 748.56
  4. Step 4: Simplify right side
    1,268.64x = 1,424,479.74
  5. Step 5: Solve for x
    x = 1,424,479.74/1,268.64
  6. Step 6: Final answer
    x = 1,122.84

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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.