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Finding the Fourth Proportional to 361.80, 541.78 and 239.70

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Solution

The fourth proportional to 361.80, 541.78 and 239.70 is: 358.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.80 : 541.78 = 239.70 : x
  2. Step 2: Convert to fraction form
    361.80/541.78 = 239.70/x
  3. Step 3: Cross multiply
    361.80x = 541.78 × 239.70
  4. Step 4: Simplify right side
    361.80x = 129,864.67
  5. Step 5: Solve for x
    x = 129,864.67/361.80
  6. Step 6: Final answer
    x = 358.94

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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.