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Finding the Fourth Proportional to 409.34, 613.96 and 120.80

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Solution

The fourth proportional to 409.34, 613.96 and 120.80 is: 181.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.34 : 613.96 = 120.80 : x
  2. Step 2: Convert to fraction form
    409.34/613.96 = 120.80/x
  3. Step 3: Cross multiply
    409.34x = 613.96 × 120.80
  4. Step 4: Simplify right side
    409.34x = 74,163.00
  5. Step 5: Solve for x
    x = 74,163.00/409.34
  6. Step 6: Final answer
    x = 181.18

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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.