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Finding the Fourth Proportional to 518.09, 776.39 and 257.81

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Solution

The fourth proportional to 518.09, 776.39 and 257.81 is: 386.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.09 : 776.39 = 257.81 : x
  2. Step 2: Convert to fraction form
    518.09/776.39 = 257.81/x
  3. Step 3: Cross multiply
    518.09x = 776.39 × 257.81
  4. Step 4: Simplify right side
    518.09x = 200,155.93
  5. Step 5: Solve for x
    x = 200,155.93/518.09
  6. Step 6: Final answer
    x = 386.34

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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.