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Finding the Fourth Proportional to 239.19, 329.82 and 156.30

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Solution

The fourth proportional to 239.19, 329.82 and 156.30 is: 215.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.19 : 329.82 = 156.30 : x
  2. Step 2: Convert to fraction form
    239.19/329.82 = 156.30/x
  3. Step 3: Cross multiply
    239.19x = 329.82 × 156.30
  4. Step 4: Simplify right side
    239.19x = 51,550.87
  5. Step 5: Solve for x
    x = 51,550.87/239.19
  6. Step 6: Final answer
    x = 215.52

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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.