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Finding the Fourth Proportional to 1,272.60, 1,909.05 and 450.85

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Solution

The fourth proportional to 1,272.60, 1,909.05 and 450.85 is: 676.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.60 : 1,909.05 = 450.85 : x
  2. Step 2: Convert to fraction form
    1,272.60/1,909.05 = 450.85/x
  3. Step 3: Cross multiply
    1,272.60x = 1,909.05 × 450.85
  4. Step 4: Simplify right side
    1,272.60x = 860,695.19
  5. Step 5: Solve for x
    x = 860,695.19/1,272.60
  6. Step 6: Final answer
    x = 676.33

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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.