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Finding the Fourth Proportional to 217.37, 299.91 and 128.88

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Solution

The fourth proportional to 217.37, 299.91 and 128.88 is: 177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.37 : 299.91 = 128.88 : x
  2. Step 2: Convert to fraction form
    217.37/299.91 = 128.88/x
  3. Step 3: Cross multiply
    217.37x = 299.91 × 128.88
  4. Step 4: Simplify right side
    217.37x = 38,652.40
  5. Step 5: Solve for x
    x = 38,652.40/217.37
  6. Step 6: Final answer
    x = 177.82

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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.