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Finding the Fourth Proportional to 443.72, 664.56 and 212.77

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Solution

The fourth proportional to 443.72, 664.56 and 212.77 is: 318.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.72 : 664.56 = 212.77 : x
  2. Step 2: Convert to fraction form
    443.72/664.56 = 212.77/x
  3. Step 3: Cross multiply
    443.72x = 664.56 × 212.77
  4. Step 4: Simplify right side
    443.72x = 141,397.37
  5. Step 5: Solve for x
    x = 141,397.37/443.72
  6. Step 6: Final answer
    x = 318.67

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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.