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Finding the Fourth Proportional to 216.72, 299.22 and 139.20

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Solution

The fourth proportional to 216.72, 299.22 and 139.20 is: 192.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.72 : 299.22 = 139.20 : x
  2. Step 2: Convert to fraction form
    216.72/299.22 = 139.20/x
  3. Step 3: Cross multiply
    216.72x = 299.22 × 139.20
  4. Step 4: Simplify right side
    216.72x = 41,651.42
  5. Step 5: Solve for x
    x = 41,651.42/216.72
  6. Step 6: Final answer
    x = 192.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.