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Finding the Fourth Proportional to 238.26, 328.61 and 155.39

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Solution

The fourth proportional to 238.26, 328.61 and 155.39 is: 214.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.26 : 328.61 = 155.39 : x
  2. Step 2: Convert to fraction form
    238.26/328.61 = 155.39/x
  3. Step 3: Cross multiply
    238.26x = 328.61 × 155.39
  4. Step 4: Simplify right side
    238.26x = 51,063.92
  5. Step 5: Solve for x
    x = 51,063.92/238.26
  6. Step 6: Final answer
    x = 214.32

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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.