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Finding the Fourth Proportional to 311.37, 467.06 and 128.72

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Solution

The fourth proportional to 311.37, 467.06 and 128.72 is: 193.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.37 : 467.06 = 128.72 : x
  2. Step 2: Convert to fraction form
    311.37/467.06 = 128.72/x
  3. Step 3: Cross multiply
    311.37x = 467.06 × 128.72
  4. Step 4: Simplify right side
    311.37x = 60,116.98
  5. Step 5: Solve for x
    x = 60,116.98/311.37
  6. Step 6: Final answer
    x = 193.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.