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Finding the Fourth Proportional to 395.63, 593.71 and 139.13

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Solution

The fourth proportional to 395.63, 593.71 and 139.13 is: 208.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.63 : 593.71 = 139.13 : x
  2. Step 2: Convert to fraction form
    395.63/593.71 = 139.13/x
  3. Step 3: Cross multiply
    395.63x = 593.71 × 139.13
  4. Step 4: Simplify right side
    395.63x = 82,599.56
  5. Step 5: Solve for x
    x = 82,599.56/395.63
  6. Step 6: Final answer
    x = 208.78

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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.