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Finding the Fourth Proportional to 518.80, 715.76 and 394.33

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Solution

The fourth proportional to 518.80, 715.76 and 394.33 is: 544.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.80 : 715.76 = 394.33 : x
  2. Step 2: Convert to fraction form
    518.80/715.76 = 394.33/x
  3. Step 3: Cross multiply
    518.80x = 715.76 × 394.33
  4. Step 4: Simplify right side
    518.80x = 282,243.67
  5. Step 5: Solve for x
    x = 282,243.67/518.80
  6. Step 6: Final answer
    x = 544.03

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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.