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Finding the Fourth Proportional to 443.41, 665.20 and 135.31

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Solution

The fourth proportional to 443.41, 665.20 and 135.31 is: 202.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.41 : 665.20 = 135.31 : x
  2. Step 2: Convert to fraction form
    443.41/665.20 = 135.31/x
  3. Step 3: Cross multiply
    443.41x = 665.20 × 135.31
  4. Step 4: Simplify right side
    443.41x = 90,008.21
  5. Step 5: Solve for x
    x = 90,008.21/443.41
  6. Step 6: Final answer
    x = 202.99

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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.