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Finding the Fourth Proportional to 519.40, 716.86 and 394.86

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Solution

The fourth proportional to 519.40, 716.86 and 394.86 is: 544.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.40 : 716.86 = 394.86 : x
  2. Step 2: Convert to fraction form
    519.40/716.86 = 394.86/x
  3. Step 3: Cross multiply
    519.40x = 716.86 × 394.86
  4. Step 4: Simplify right side
    519.40x = 283,059.34
  5. Step 5: Solve for x
    x = 283,059.34/519.40
  6. Step 6: Final answer
    x = 544.97

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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.