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Finding the Fourth Proportional to 238.95, 358.56 and 220.86

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Solution

The fourth proportional to 238.95, 358.56 and 220.86 is: 331.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.95 : 358.56 = 220.86 : x
  2. Step 2: Convert to fraction form
    238.95/358.56 = 220.86/x
  3. Step 3: Cross multiply
    238.95x = 358.56 × 220.86
  4. Step 4: Simplify right side
    238.95x = 79,191.56
  5. Step 5: Solve for x
    x = 79,191.56/238.95
  6. Step 6: Final answer
    x = 331.41

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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.