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Finding the Fourth Proportional to 778.85, 1,074.80 and 447.29

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Solution

The fourth proportional to 778.85, 1,074.80 and 447.29 is: 617.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.85 : 1,074.80 = 447.29 : x
  2. Step 2: Convert to fraction form
    778.85/1,074.80 = 447.29/x
  3. Step 3: Cross multiply
    778.85x = 1,074.80 × 447.29
  4. Step 4: Simplify right side
    778.85x = 480,739.68
  5. Step 5: Solve for x
    x = 480,739.68/778.85
  6. Step 6: Final answer
    x = 617.25

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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.