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Finding the Fourth Proportional to 239.45, 330.21 and 152.10

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Solution

The fourth proportional to 239.45, 330.21 and 152.10 is: 209.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.45 : 330.21 = 152.10 : x
  2. Step 2: Convert to fraction form
    239.45/330.21 = 152.10/x
  3. Step 3: Cross multiply
    239.45x = 330.21 × 152.10
  4. Step 4: Simplify right side
    239.45x = 50,224.94
  5. Step 5: Solve for x
    x = 50,224.94/239.45
  6. Step 6: Final answer
    x = 209.76

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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.