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Finding the Fourth Proportional to 213.51, 320.09 and 122.27

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Solution

The fourth proportional to 213.51, 320.09 and 122.27 is: 183.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.51 : 320.09 = 122.27 : x
  2. Step 2: Convert to fraction form
    213.51/320.09 = 122.27/x
  3. Step 3: Cross multiply
    213.51x = 320.09 × 122.27
  4. Step 4: Simplify right side
    213.51x = 39,136.61
  5. Step 5: Solve for x
    x = 39,136.61/213.51
  6. Step 6: Final answer
    x = 183.30

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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.