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Finding the Fourth Proportional to 219.89, 328.91 and 154.88

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Solution

The fourth proportional to 219.89, 328.91 and 154.88 is: 231.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.89 : 328.91 = 154.88 : x
  2. Step 2: Convert to fraction form
    219.89/328.91 = 154.88/x
  3. Step 3: Cross multiply
    219.89x = 328.91 × 154.88
  4. Step 4: Simplify right side
    219.89x = 50,939.16
  5. Step 5: Solve for x
    x = 50,939.16/219.89
  6. Step 6: Final answer
    x = 231.66

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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.