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Finding the Fourth Proportional to 445.44, 664.41 and 399.30

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Solution

The fourth proportional to 445.44, 664.41 and 399.30 is: 595.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.44 : 664.41 = 399.30 : x
  2. Step 2: Convert to fraction form
    445.44/664.41 = 399.30/x
  3. Step 3: Cross multiply
    445.44x = 664.41 × 399.30
  4. Step 4: Simplify right side
    445.44x = 265,298.91
  5. Step 5: Solve for x
    x = 265,298.91/445.44
  6. Step 6: Final answer
    x = 595.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.