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Finding the Fourth Proportional to 311.42, 467.69 and 172.55

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Solution

The fourth proportional to 311.42, 467.69 and 172.55 is: 259.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.42 : 467.69 = 172.55 : x
  2. Step 2: Convert to fraction form
    311.42/467.69 = 172.55/x
  3. Step 3: Cross multiply
    311.42x = 467.69 × 172.55
  4. Step 4: Simplify right side
    311.42x = 80,700.22
  5. Step 5: Solve for x
    x = 80,700.22/311.42
  6. Step 6: Final answer
    x = 259.13

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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.