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Finding the Fourth Proportional to 216.46, 324.26 and 147.81

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Solution

The fourth proportional to 216.46, 324.26 and 147.81 is: 221.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.46 : 324.26 = 147.81 : x
  2. Step 2: Convert to fraction form
    216.46/324.26 = 147.81/x
  3. Step 3: Cross multiply
    216.46x = 324.26 × 147.81
  4. Step 4: Simplify right side
    216.46x = 47,929.31
  5. Step 5: Solve for x
    x = 47,929.31/216.46
  6. Step 6: Final answer
    x = 221.42

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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.