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Finding the Fourth Proportional to 239.72, 330.87 and 152.38

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Solution

The fourth proportional to 239.72, 330.87 and 152.38 is: 210.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.72 : 330.87 = 152.38 : x
  2. Step 2: Convert to fraction form
    239.72/330.87 = 152.38/x
  3. Step 3: Cross multiply
    239.72x = 330.87 × 152.38
  4. Step 4: Simplify right side
    239.72x = 50,415.74
  5. Step 5: Solve for x
    x = 50,415.74/239.72
  6. Step 6: Final answer
    x = 210.31

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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.