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Finding the Fourth Proportional to 518.41, 776.54 and 388.63

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Solution

The fourth proportional to 518.41, 776.54 and 388.63 is: 582.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.41 : 776.54 = 388.63 : x
  2. Step 2: Convert to fraction form
    518.41/776.54 = 388.63/x
  3. Step 3: Cross multiply
    518.41x = 776.54 × 388.63
  4. Step 4: Simplify right side
    518.41x = 301,782.86
  5. Step 5: Solve for x
    x = 301,782.86/518.41
  6. Step 6: Final answer
    x = 582.14

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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.