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Finding the Fourth Proportional to 1,268.22, 1,902.25 and 402.47

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Solution

The fourth proportional to 1,268.22, 1,902.25 and 402.47 is: 603.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.22 : 1,902.25 = 402.47 : x
  2. Step 2: Convert to fraction form
    1,268.22/1,902.25 = 402.47/x
  3. Step 3: Cross multiply
    1,268.22x = 1,902.25 × 402.47
  4. Step 4: Simplify right side
    1,268.22x = 765,596.68
  5. Step 5: Solve for x
    x = 765,596.68/1,268.22
  6. Step 6: Final answer
    x = 603.68

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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.