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Finding the Fourth Proportional to 216.27, 298.53 and 128.97

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Solution

The fourth proportional to 216.27, 298.53 and 128.97 is: 178.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.27 : 298.53 = 128.97 : x
  2. Step 2: Convert to fraction form
    216.27/298.53 = 128.97/x
  3. Step 3: Cross multiply
    216.27x = 298.53 × 128.97
  4. Step 4: Simplify right side
    216.27x = 38,501.41
  5. Step 5: Solve for x
    x = 38,501.41/216.27
  6. Step 6: Final answer
    x = 178.02

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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.