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Finding the Fourth Proportional to 778.78, 1,074.58 and 447.22

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Solution

The fourth proportional to 778.78, 1,074.58 and 447.22 is: 617.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.78 : 1,074.58 = 447.22 : x
  2. Step 2: Convert to fraction form
    778.78/1,074.58 = 447.22/x
  3. Step 3: Cross multiply
    778.78x = 1,074.58 × 447.22
  4. Step 4: Simplify right side
    778.78x = 480,573.67
  5. Step 5: Solve for x
    x = 480,573.67/778.78
  6. Step 6: Final answer
    x = 617.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.