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Finding the Fourth Proportional to 409.26, 613.91 and 120.70

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Solution

The fourth proportional to 409.26, 613.91 and 120.70 is: 181.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.26 : 613.91 = 120.70 : x
  2. Step 2: Convert to fraction form
    409.26/613.91 = 120.70/x
  3. Step 3: Cross multiply
    409.26x = 613.91 × 120.70
  4. Step 4: Simplify right side
    409.26x = 74,098.94
  5. Step 5: Solve for x
    x = 74,098.94/409.26
  6. Step 6: Final answer
    x = 181.06

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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.