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Finding the Fourth Proportional to 344.87, 517.30 and 139.38

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Solution

The fourth proportional to 344.87, 517.30 and 139.38 is: 209.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.87 : 517.30 = 139.38 : x
  2. Step 2: Convert to fraction form
    344.87/517.30 = 139.38/x
  3. Step 3: Cross multiply
    344.87x = 517.30 × 139.38
  4. Step 4: Simplify right side
    344.87x = 72,100.44
  5. Step 5: Solve for x
    x = 72,100.44/344.87
  6. Step 6: Final answer
    x = 209.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.