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Finding the Fourth Proportional to 456.44, 683.89 and 212.81

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Solution

The fourth proportional to 456.44, 683.89 and 212.81 is: 318.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.44 : 683.89 = 212.81 : x
  2. Step 2: Convert to fraction form
    456.44/683.89 = 212.81/x
  3. Step 3: Cross multiply
    456.44x = 683.89 × 212.81
  4. Step 4: Simplify right side
    456.44x = 145,534.68
  5. Step 5: Solve for x
    x = 145,534.68/456.44
  6. Step 6: Final answer
    x = 318.85

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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.