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Finding the Fourth Proportional to 651.21, 976.88 and 218.43

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Solution

The fourth proportional to 651.21, 976.88 and 218.43 is: 327.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.21 : 976.88 = 218.43 : x
  2. Step 2: Convert to fraction form
    651.21/976.88 = 218.43/x
  3. Step 3: Cross multiply
    651.21x = 976.88 × 218.43
  4. Step 4: Simplify right side
    651.21x = 213,378.81
  5. Step 5: Solve for x
    x = 213,378.81/651.21
  6. Step 6: Final answer
    x = 327.67

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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.