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Finding the Fourth Proportional to 238.18, 328.76 and 155.31

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Solution

The fourth proportional to 238.18, 328.76 and 155.31 is: 214.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.18 : 328.76 = 155.31 : x
  2. Step 2: Convert to fraction form
    238.18/328.76 = 155.31/x
  3. Step 3: Cross multiply
    238.18x = 328.76 × 155.31
  4. Step 4: Simplify right side
    238.18x = 51,059.72
  5. Step 5: Solve for x
    x = 51,059.72/238.18
  6. Step 6: Final answer
    x = 214.37

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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.