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Finding the Fourth Proportional to 1,273.78, 1,910.20 and 451.83

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Solution

The fourth proportional to 1,273.78, 1,910.20 and 451.83 is: 677.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,273.78 : 1,910.20 = 451.83 : x
  2. Step 2: Convert to fraction form
    1,273.78/1,910.20 = 451.83/x
  3. Step 3: Cross multiply
    1,273.78x = 1,910.20 × 451.83
  4. Step 4: Simplify right side
    1,273.78x = 863,085.67
  5. Step 5: Solve for x
    x = 863,085.67/1,273.78
  6. Step 6: Final answer
    x = 677.58

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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.