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Finding the Fourth Proportional to 239.12, 330 and 139.55

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Solution

The fourth proportional to 239.12, 330 and 139.55 is: 192.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.12 : 330 = 139.55 : x
  2. Step 2: Convert to fraction form
    239.12/330 = 139.55/x
  3. Step 3: Cross multiply
    239.12x = 330 × 139.55
  4. Step 4: Simplify right side
    239.12x = 46,051.50
  5. Step 5: Solve for x
    x = 46,051.50/239.12
  6. Step 6: Final answer
    x = 192.59

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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.