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Finding the Fourth Proportional to 318.10, 476.86 and 163.68

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Solution

The fourth proportional to 318.10, 476.86 and 163.68 is: 245.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.10 : 476.86 = 163.68 : x
  2. Step 2: Convert to fraction form
    318.10/476.86 = 163.68/x
  3. Step 3: Cross multiply
    318.10x = 476.86 × 163.68
  4. Step 4: Simplify right side
    318.10x = 78,054.37
  5. Step 5: Solve for x
    x = 78,054.37/318.10
  6. Step 6: Final answer
    x = 245.38

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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.