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Finding the Fourth Proportional to 216.96, 325.68 and 120.72

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Solution

The fourth proportional to 216.96, 325.68 and 120.72 is: 181.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.96 : 325.68 = 120.72 : x
  2. Step 2: Convert to fraction form
    216.96/325.68 = 120.72/x
  3. Step 3: Cross multiply
    216.96x = 325.68 × 120.72
  4. Step 4: Simplify right side
    216.96x = 39,316.09
  5. Step 5: Solve for x
    x = 39,316.09/216.96
  6. Step 6: Final answer
    x = 181.21

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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.