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Finding the Fourth Proportional to 518, 775.92 and 388.12

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Solution

The fourth proportional to 518, 775.92 and 388.12 is: 581.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    518 : 775.92 = 388.12 : x
  2. Step 2: Convert to fraction form
    518/775.92 = 388.12/x
  3. Step 3: Cross multiply
    518x = 775.92 × 388.12
  4. Step 4: Simplify right side
    518x = 301,150.07
  5. Step 5: Solve for x
    x = 301,150.07/518
  6. Step 6: Final answer
    x = 581.37

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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.