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Finding the Fourth Proportional to 319.86, 441.18 and 221.65

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Solution

The fourth proportional to 319.86, 441.18 and 221.65 is: 305.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.86 : 441.18 = 221.65 : x
  2. Step 2: Convert to fraction form
    319.86/441.18 = 221.65/x
  3. Step 3: Cross multiply
    319.86x = 441.18 × 221.65
  4. Step 4: Simplify right side
    319.86x = 97,786.44
  5. Step 5: Solve for x
    x = 97,786.44/319.86
  6. Step 6: Final answer
    x = 305.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.