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Finding the Fourth Proportional to 239.15, 329.68 and 156.23

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Solution

The fourth proportional to 239.15, 329.68 and 156.23 is: 215.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.15 : 329.68 = 156.23 : x
  2. Step 2: Convert to fraction form
    239.15/329.68 = 156.23/x
  3. Step 3: Cross multiply
    239.15x = 329.68 × 156.23
  4. Step 4: Simplify right side
    239.15x = 51,505.91
  5. Step 5: Solve for x
    x = 51,505.91/239.15
  6. Step 6: Final answer
    x = 215.37

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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.