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Finding the Fourth Proportional to 312.15, 467.98 and 163.55

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Solution

The fourth proportional to 312.15, 467.98 and 163.55 is: 245.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.15 : 467.98 = 163.55 : x
  2. Step 2: Convert to fraction form
    312.15/467.98 = 163.55/x
  3. Step 3: Cross multiply
    312.15x = 467.98 × 163.55
  4. Step 4: Simplify right side
    312.15x = 76,538.13
  5. Step 5: Solve for x
    x = 76,538.13/312.15
  6. Step 6: Final answer
    x = 245.20

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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.