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Finding the Fourth Proportional to 219.93, 329.89 and 65.86

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Solution

The fourth proportional to 219.93, 329.89 and 65.86 is: 98.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.93 : 329.89 = 65.86 : x
  2. Step 2: Convert to fraction form
    219.93/329.89 = 65.86/x
  3. Step 3: Cross multiply
    219.93x = 329.89 × 65.86
  4. Step 4: Simplify right side
    219.93x = 21,726.56
  5. Step 5: Solve for x
    x = 21,726.56/219.93
  6. Step 6: Final answer
    x = 98.79

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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.