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Finding the Fourth Proportional to 778.82, 1,168.83 and 389.21

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Solution

The fourth proportional to 778.82, 1,168.83 and 389.21 is: 584.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.82 : 1,168.83 = 389.21 : x
  2. Step 2: Convert to fraction form
    778.82/1,168.83 = 389.21/x
  3. Step 3: Cross multiply
    778.82x = 1,168.83 × 389.21
  4. Step 4: Simplify right side
    778.82x = 454,914.48
  5. Step 5: Solve for x
    x = 454,914.48/778.82
  6. Step 6: Final answer
    x = 584.11

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Double scale
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1.5x scale

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.