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Finding the Fourth Proportional to 518.09, 777.63 and 380.75

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Solution

The fourth proportional to 518.09, 777.63 and 380.75 is: 571.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.09 : 777.63 = 380.75 : x
  2. Step 2: Convert to fraction form
    518.09/777.63 = 380.75/x
  3. Step 3: Cross multiply
    518.09x = 777.63 × 380.75
  4. Step 4: Simplify right side
    518.09x = 296,078.73
  5. Step 5: Solve for x
    x = 296,078.73/518.09
  6. Step 6: Final answer
    x = 571.49

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Double scale
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Similar ratio
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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.