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Finding the Fourth Proportional to 213.81, 320.55 and 122.55

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Solution

The fourth proportional to 213.81, 320.55 and 122.55 is: 183.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.81 : 320.55 = 122.55 : x
  2. Step 2: Convert to fraction form
    213.81/320.55 = 122.55/x
  3. Step 3: Cross multiply
    213.81x = 320.55 × 122.55
  4. Step 4: Simplify right side
    213.81x = 39,283.40
  5. Step 5: Solve for x
    x = 39,283.40/213.81
  6. Step 6: Final answer
    x = 183.73

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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.