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Finding the Fourth Proportional to 1,272.20, 1,908.92 and 450.86

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Solution

The fourth proportional to 1,272.20, 1,908.92 and 450.86 is: 676.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.20 : 1,908.92 = 450.86 : x
  2. Step 2: Convert to fraction form
    1,272.20/1,908.92 = 450.86/x
  3. Step 3: Cross multiply
    1,272.20x = 1,908.92 × 450.86
  4. Step 4: Simplify right side
    1,272.20x = 860,655.67
  5. Step 5: Solve for x
    x = 860,655.67/1,272.20
  6. Step 6: Final answer
    x = 676.51

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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.