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Finding the Fourth Proportional to 216.28, 298.43 and 128.98

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Solution

The fourth proportional to 216.28, 298.43 and 128.98 is: 177.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.28 : 298.43 = 128.98 : x
  2. Step 2: Convert to fraction form
    216.28/298.43 = 128.98/x
  3. Step 3: Cross multiply
    216.28x = 298.43 × 128.98
  4. Step 4: Simplify right side
    216.28x = 38,491.50
  5. Step 5: Solve for x
    x = 38,491.50/216.28
  6. Step 6: Final answer
    x = 177.97

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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.