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Finding the Fourth Proportional to 519.66, 717.62 and 388.44

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Solution

The fourth proportional to 519.66, 717.62 and 388.44 is: 536.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.66 : 717.62 = 388.44 : x
  2. Step 2: Convert to fraction form
    519.66/717.62 = 388.44/x
  3. Step 3: Cross multiply
    519.66x = 717.62 × 388.44
  4. Step 4: Simplify right side
    519.66x = 278,750.37
  5. Step 5: Solve for x
    x = 278,750.37/519.66
  6. Step 6: Final answer
    x = 536.41

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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.