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Finding the Fourth Proportional to 778.73, 1,074.19 and 513.21

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Solution

The fourth proportional to 778.73, 1,074.19 and 513.21 is: 707.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.73 : 1,074.19 = 513.21 : x
  2. Step 2: Convert to fraction form
    778.73/1,074.19 = 513.21/x
  3. Step 3: Cross multiply
    778.73x = 1,074.19 × 513.21
  4. Step 4: Simplify right side
    778.73x = 551,287.54
  5. Step 5: Solve for x
    x = 551,287.54/778.73
  6. Step 6: Final answer
    x = 707.93

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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.