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Finding the Fourth Proportional to 1,272.96, 1,908.79 and 451.11

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Solution

The fourth proportional to 1,272.96, 1,908.79 and 451.11 is: 676.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.96 : 1,908.79 = 451.11 : x
  2. Step 2: Convert to fraction form
    1,272.96/1,908.79 = 451.11/x
  3. Step 3: Cross multiply
    1,272.96x = 1,908.79 × 451.11
  4. Step 4: Simplify right side
    1,272.96x = 861,074.26
  5. Step 5: Solve for x
    x = 861,074.26/1,272.96
  6. Step 6: Final answer
    x = 676.43

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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.