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Finding the Fourth Proportional to 318.82, 478.37 and 145.54

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Solution

The fourth proportional to 318.82, 478.37 and 145.54 is: 218.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.82 : 478.37 = 145.54 : x
  2. Step 2: Convert to fraction form
    318.82/478.37 = 145.54/x
  3. Step 3: Cross multiply
    318.82x = 478.37 × 145.54
  4. Step 4: Simplify right side
    318.82x = 69,621.14
  5. Step 5: Solve for x
    x = 69,621.14/318.82
  6. Step 6: Final answer
    x = 218.37

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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.