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Finding the Fourth Proportional to 1,268.40, 1,902.74 and 402.51

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Solution

The fourth proportional to 1,268.40, 1,902.74 and 402.51 is: 603.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.40 : 1,902.74 = 402.51 : x
  2. Step 2: Convert to fraction form
    1,268.40/1,902.74 = 402.51/x
  3. Step 3: Cross multiply
    1,268.40x = 1,902.74 × 402.51
  4. Step 4: Simplify right side
    1,268.40x = 765,869.86
  5. Step 5: Solve for x
    x = 765,869.86/1,268.40
  6. Step 6: Final answer
    x = 603.81

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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.