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Finding the Fourth Proportional to 319.30, 440.56 and 219.79

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Solution

The fourth proportional to 319.30, 440.56 and 219.79 is: 303.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.30 : 440.56 = 219.79 : x
  2. Step 2: Convert to fraction form
    319.30/440.56 = 219.79/x
  3. Step 3: Cross multiply
    319.30x = 440.56 × 219.79
  4. Step 4: Simplify right side
    319.30x = 96,827.93
  5. Step 5: Solve for x
    x = 96,827.93/319.30
  6. Step 6: Final answer
    x = 303.26

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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.