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Finding the Fourth Proportional to 239.13, 329.85 and 156.15

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Solution

The fourth proportional to 239.13, 329.85 and 156.15 is: 215.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.13 : 329.85 = 156.15 : x
  2. Step 2: Convert to fraction form
    239.13/329.85 = 156.15/x
  3. Step 3: Cross multiply
    239.13x = 329.85 × 156.15
  4. Step 4: Simplify right side
    239.13x = 51,506.08
  5. Step 5: Solve for x
    x = 51,506.08/239.13
  6. Step 6: Final answer
    x = 215.39

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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.