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Finding the Fourth Proportional to 238.20, 328.79 and 139.92

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Solution

The fourth proportional to 238.20, 328.79 and 139.92 is: 193.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.20 : 328.79 = 139.92 : x
  2. Step 2: Convert to fraction form
    238.20/328.79 = 139.92/x
  3. Step 3: Cross multiply
    238.20x = 328.79 × 139.92
  4. Step 4: Simplify right side
    238.20x = 46,004.30
  5. Step 5: Solve for x
    x = 46,004.30/238.20
  6. Step 6: Final answer
    x = 193.13

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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.