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Finding the Fourth Proportional to 216.28, 298.91 and 172.54

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Solution

The fourth proportional to 216.28, 298.91 and 172.54 is: 238.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.28 : 298.91 = 172.54 : x
  2. Step 2: Convert to fraction form
    216.28/298.91 = 172.54/x
  3. Step 3: Cross multiply
    216.28x = 298.91 × 172.54
  4. Step 4: Simplify right side
    216.28x = 51,571.57
  5. Step 5: Solve for x
    x = 51,571.57/216.28
  6. Step 6: Final answer
    x = 238.45

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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.