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Finding the Fourth Proportional to 778.26, 1,074.28 and 479.55

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Solution

The fourth proportional to 778.26, 1,074.28 and 479.55 is: 661.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.26 : 1,074.28 = 479.55 : x
  2. Step 2: Convert to fraction form
    778.26/1,074.28 = 479.55/x
  3. Step 3: Cross multiply
    778.26x = 1,074.28 × 479.55
  4. Step 4: Simplify right side
    778.26x = 515,176.73
  5. Step 5: Solve for x
    x = 515,176.73/778.26
  6. Step 6: Final answer
    x = 661.96

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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.