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Finding the Fourth Proportional to 216.99, 325.65 and 80.12

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Solution

The fourth proportional to 216.99, 325.65 and 80.12 is: 120.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.99 : 325.65 = 80.12 : x
  2. Step 2: Convert to fraction form
    216.99/325.65 = 80.12/x
  3. Step 3: Cross multiply
    216.99x = 325.65 × 80.12
  4. Step 4: Simplify right side
    216.99x = 26,091.08
  5. Step 5: Solve for x
    x = 26,091.08/216.99
  6. Step 6: Final answer
    x = 120.24

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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.