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Finding the Fourth Proportional to 238.90, 358.41 and 147.70

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Solution

The fourth proportional to 238.90, 358.41 and 147.70 is: 221.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.90 : 358.41 = 147.70 : x
  2. Step 2: Convert to fraction form
    238.90/358.41 = 147.70/x
  3. Step 3: Cross multiply
    238.90x = 358.41 × 147.70
  4. Step 4: Simplify right side
    238.90x = 52,936.42
  5. Step 5: Solve for x
    x = 52,936.42/238.90
  6. Step 6: Final answer
    x = 221.59

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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.