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Finding the Fourth Proportional to 778.54, 1,167.81 and 520.21

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Solution

The fourth proportional to 778.54, 1,167.81 and 520.21 is: 780.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.54 : 1,167.81 = 520.21 : x
  2. Step 2: Convert to fraction form
    778.54/1,167.81 = 520.21/x
  3. Step 3: Cross multiply
    778.54x = 1,167.81 × 520.21
  4. Step 4: Simplify right side
    778.54x = 607,506.44
  5. Step 5: Solve for x
    x = 607,506.44/778.54
  6. Step 6: Final answer
    x = 780.32

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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.