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Finding the Fourth Proportional to 304.99, 421.01 and 217.64

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Solution

The fourth proportional to 304.99, 421.01 and 217.64 is: 300.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.99 : 421.01 = 217.64 : x
  2. Step 2: Convert to fraction form
    304.99/421.01 = 217.64/x
  3. Step 3: Cross multiply
    304.99x = 421.01 × 217.64
  4. Step 4: Simplify right side
    304.99x = 91,628.62
  5. Step 5: Solve for x
    x = 91,628.62/304.99
  6. Step 6: Final answer
    x = 300.43

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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.