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Finding the Fourth Proportional to 519.76, 716.68 and 388.54

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Solution

The fourth proportional to 519.76, 716.68 and 388.54 is: 535.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.76 : 716.68 = 388.54 : x
  2. Step 2: Convert to fraction form
    519.76/716.68 = 388.54/x
  3. Step 3: Cross multiply
    519.76x = 716.68 × 388.54
  4. Step 4: Simplify right side
    519.76x = 278,458.85
  5. Step 5: Solve for x
    x = 278,458.85/519.76
  6. Step 6: Final answer
    x = 535.75

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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.