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Finding the Fourth Proportional to 519.38, 715.99 and 408.67

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Solution

The fourth proportional to 519.38, 715.99 and 408.67 is: 563.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.38 : 715.99 = 408.67 : x
  2. Step 2: Convert to fraction form
    519.38/715.99 = 408.67/x
  3. Step 3: Cross multiply
    519.38x = 715.99 × 408.67
  4. Step 4: Simplify right side
    519.38x = 292,603.63
  5. Step 5: Solve for x
    x = 292,603.63/519.38
  6. Step 6: Final answer
    x = 563.37

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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.