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Finding the Fourth Proportional to 1,268.31, 1,902.58 and 343.87

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Solution

The fourth proportional to 1,268.31, 1,902.58 and 343.87 is: 515.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.31 : 1,902.58 = 343.87 : x
  2. Step 2: Convert to fraction form
    1,268.31/1,902.58 = 343.87/x
  3. Step 3: Cross multiply
    1,268.31x = 1,902.58 × 343.87
  4. Step 4: Simplify right side
    1,268.31x = 654,241.70
  5. Step 5: Solve for x
    x = 654,241.70/1,268.31
  6. Step 6: Final answer
    x = 515.84

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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.