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Finding the Fourth Proportional to 395.99, 593.99 and 139.31

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Solution

The fourth proportional to 395.99, 593.99 and 139.31 is: 208.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.99 : 593.99 = 139.31 : x
  2. Step 2: Convert to fraction form
    395.99/593.99 = 139.31/x
  3. Step 3: Cross multiply
    395.99x = 593.99 × 139.31
  4. Step 4: Simplify right side
    395.99x = 82,748.75
  5. Step 5: Solve for x
    x = 82,748.75/395.99
  6. Step 6: Final answer
    x = 208.97

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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.