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Finding the Fourth Proportional to 238.90, 329.78 and 156.08

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Solution

The fourth proportional to 238.90, 329.78 and 156.08 is: 215.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.90 : 329.78 = 156.08 : x
  2. Step 2: Convert to fraction form
    238.90/329.78 = 156.08/x
  3. Step 3: Cross multiply
    238.90x = 329.78 × 156.08
  4. Step 4: Simplify right side
    238.90x = 51,472.06
  5. Step 5: Solve for x
    x = 51,472.06/238.90
  6. Step 6: Final answer
    x = 215.45

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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.