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Finding the Fourth Proportional to 311.45, 467.10 and 128.79

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Solution

The fourth proportional to 311.45, 467.10 and 128.79 is: 193.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.45 : 467.10 = 128.79 : x
  2. Step 2: Convert to fraction form
    311.45/467.10 = 128.79/x
  3. Step 3: Cross multiply
    311.45x = 467.10 × 128.79
  4. Step 4: Simplify right side
    311.45x = 60,157.81
  5. Step 5: Solve for x
    x = 60,157.81/311.45
  6. Step 6: Final answer
    x = 193.16

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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.