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Finding the Fourth Proportional to 1,268.32, 1,902.20 and 402.40

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Solution

The fourth proportional to 1,268.32, 1,902.20 and 402.40 is: 603.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.32 : 1,902.20 = 402.40 : x
  2. Step 2: Convert to fraction form
    1,268.32/1,902.20 = 402.40/x
  3. Step 3: Cross multiply
    1,268.32x = 1,902.20 × 402.40
  4. Step 4: Simplify right side
    1,268.32x = 765,445.28
  5. Step 5: Solve for x
    x = 765,445.28/1,268.32
  6. Step 6: Final answer
    x = 603.51

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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.