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Finding the Fourth Proportional to 239.79, 331.02 and 152.58

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Solution

The fourth proportional to 239.79, 331.02 and 152.58 is: 210.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.79 : 331.02 = 152.58 : x
  2. Step 2: Convert to fraction form
    239.79/331.02 = 152.58/x
  3. Step 3: Cross multiply
    239.79x = 331.02 × 152.58
  4. Step 4: Simplify right side
    239.79x = 50,507.03
  5. Step 5: Solve for x
    x = 50,507.03/239.79
  6. Step 6: Final answer
    x = 210.63

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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.