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Finding the Fourth Proportional to 1,268.50, 1,902.69 and 402.70

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Solution

The fourth proportional to 1,268.50, 1,902.69 and 402.70 is: 604.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.50 : 1,902.69 = 402.70 : x
  2. Step 2: Convert to fraction form
    1,268.50/1,902.69 = 402.70/x
  3. Step 3: Cross multiply
    1,268.50x = 1,902.69 × 402.70
  4. Step 4: Simplify right side
    1,268.50x = 766,213.26
  5. Step 5: Solve for x
    x = 766,213.26/1,268.50
  6. Step 6: Final answer
    x = 604.03

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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.