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Finding the Fourth Proportional to 216.28, 298.12 and 138.52

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Solution

The fourth proportional to 216.28, 298.12 and 138.52 is: 190.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.28 : 298.12 = 138.52 : x
  2. Step 2: Convert to fraction form
    216.28/298.12 = 138.52/x
  3. Step 3: Cross multiply
    216.28x = 298.12 × 138.52
  4. Step 4: Simplify right side
    216.28x = 41,295.58
  5. Step 5: Solve for x
    x = 41,295.58/216.28
  6. Step 6: Final answer
    x = 190.94

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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.