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Finding the Fourth Proportional to 239.79, 359.82 and 102.90

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Solution

The fourth proportional to 239.79, 359.82 and 102.90 is: 154.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.79 : 359.82 = 102.90 : x
  2. Step 2: Convert to fraction form
    239.79/359.82 = 102.90/x
  3. Step 3: Cross multiply
    239.79x = 359.82 × 102.90
  4. Step 4: Simplify right side
    239.79x = 37,025.48
  5. Step 5: Solve for x
    x = 37,025.48/239.79
  6. Step 6: Final answer
    x = 154.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.