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Finding the Fourth Proportional to 239.90, 359.39 and 142.19

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Solution

The fourth proportional to 239.90, 359.39 and 142.19 is: 213.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.90 : 359.39 = 142.19 : x
  2. Step 2: Convert to fraction form
    239.90/359.39 = 142.19/x
  3. Step 3: Cross multiply
    239.90x = 359.39 × 142.19
  4. Step 4: Simplify right side
    239.90x = 51,100.77
  5. Step 5: Solve for x
    x = 51,100.77/239.90
  6. Step 6: Final answer
    x = 213.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.