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Finding the Fourth Proportional to 447.09, 670.23 and 215.79

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Solution

The fourth proportional to 447.09, 670.23 and 215.79 is: 323.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.09 : 670.23 = 215.79 : x
  2. Step 2: Convert to fraction form
    447.09/670.23 = 215.79/x
  3. Step 3: Cross multiply
    447.09x = 670.23 × 215.79
  4. Step 4: Simplify right side
    447.09x = 144,628.93
  5. Step 5: Solve for x
    x = 144,628.93/447.09
  6. Step 6: Final answer
    x = 323.49

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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.