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Finding the Fourth Proportional to 1,272.90, 1,909.26 and 451.18

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Solution

The fourth proportional to 1,272.90, 1,909.26 and 451.18 is: 676.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.90 : 1,909.26 = 451.18 : x
  2. Step 2: Convert to fraction form
    1,272.90/1,909.26 = 451.18/x
  3. Step 3: Cross multiply
    1,272.90x = 1,909.26 × 451.18
  4. Step 4: Simplify right side
    1,272.90x = 861,419.93
  5. Step 5: Solve for x
    x = 861,419.93/1,272.90
  6. Step 6: Final answer
    x = 676.74

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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.