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Finding the Fourth Proportional to 1,268.78, 1,902.76 and 446.90

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Solution

The fourth proportional to 1,268.78, 1,902.76 and 446.90 is: 670.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.78 : 1,902.76 = 446.90 : x
  2. Step 2: Convert to fraction form
    1,268.78/1,902.76 = 446.90/x
  3. Step 3: Cross multiply
    1,268.78x = 1,902.76 × 446.90
  4. Step 4: Simplify right side
    1,268.78x = 850,343.44
  5. Step 5: Solve for x
    x = 850,343.44/1,268.78
  6. Step 6: Final answer
    x = 670.21

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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.