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Finding the Fourth Proportional to 239.81, 330.90 and 151.35

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Solution

The fourth proportional to 239.81, 330.90 and 151.35 is: 208.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.81 : 330.90 = 151.35 : x
  2. Step 2: Convert to fraction form
    239.81/330.90 = 151.35/x
  3. Step 3: Cross multiply
    239.81x = 330.90 × 151.35
  4. Step 4: Simplify right side
    239.81x = 50,082.62
  5. Step 5: Solve for x
    x = 50,082.62/239.81
  6. Step 6: Final answer
    x = 208.84

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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.