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Finding the Fourth Proportional to 216.60, 324.90 and 54.28

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Solution

The fourth proportional to 216.60, 324.90 and 54.28 is: 81.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.60 : 324.90 = 54.28 : x
  2. Step 2: Convert to fraction form
    216.60/324.90 = 54.28/x
  3. Step 3: Cross multiply
    216.60x = 324.90 × 54.28
  4. Step 4: Simplify right side
    216.60x = 17,635.98
  5. Step 5: Solve for x
    x = 17,635.98/216.60
  6. Step 6: Final answer
    x = 81.42

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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.