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Finding the Fourth Proportional to 519.15, 716.51 and 394.61

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Solution

The fourth proportional to 519.15, 716.51 and 394.61 is: 544.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.15 : 716.51 = 394.61 : x
  2. Step 2: Convert to fraction form
    519.15/716.51 = 394.61/x
  3. Step 3: Cross multiply
    519.15x = 716.51 × 394.61
  4. Step 4: Simplify right side
    519.15x = 282,744.79
  5. Step 5: Solve for x
    x = 282,744.79/519.15
  6. Step 6: Final answer
    x = 544.63

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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.