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Finding the Fourth Proportional to 238.81, 329.55 and 135.31

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Solution

The fourth proportional to 238.81, 329.55 and 135.31 is: 186.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.81 : 329.55 = 135.31 : x
  2. Step 2: Convert to fraction form
    238.81/329.55 = 135.31/x
  3. Step 3: Cross multiply
    238.81x = 329.55 × 135.31
  4. Step 4: Simplify right side
    238.81x = 44,590.08
  5. Step 5: Solve for x
    x = 44,590.08/238.81
  6. Step 6: Final answer
    x = 186.72

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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.