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Finding the Fourth Proportional to 220.90, 304.86 and 122.69

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Solution

The fourth proportional to 220.90, 304.86 and 122.69 is: 169.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.90 : 304.86 = 122.69 : x
  2. Step 2: Convert to fraction form
    220.90/304.86 = 122.69/x
  3. Step 3: Cross multiply
    220.90x = 304.86 × 122.69
  4. Step 4: Simplify right side
    220.90x = 37,403.27
  5. Step 5: Solve for x
    x = 37,403.27/220.90
  6. Step 6: Final answer
    x = 169.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.