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Finding the Fourth Proportional to 239.64, 359.53 and 142.12

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Solution

The fourth proportional to 239.64, 359.53 and 142.12 is: 213.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.64 : 359.53 = 142.12 : x
  2. Step 2: Convert to fraction form
    239.64/359.53 = 142.12/x
  3. Step 3: Cross multiply
    239.64x = 359.53 × 142.12
  4. Step 4: Simplify right side
    239.64x = 51,095.68
  5. Step 5: Solve for x
    x = 51,095.68/239.64
  6. Step 6: Final answer
    x = 213.22

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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.