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Finding the Fourth Proportional to 421.37, 580.47 and 323.09

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Solution

The fourth proportional to 421.37, 580.47 and 323.09 is: 445.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.37 : 580.47 = 323.09 : x
  2. Step 2: Convert to fraction form
    421.37/580.47 = 323.09/x
  3. Step 3: Cross multiply
    421.37x = 580.47 × 323.09
  4. Step 4: Simplify right side
    421.37x = 187,544.05
  5. Step 5: Solve for x
    x = 187,544.05/421.37
  6. Step 6: Final answer
    x = 445.08

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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.