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Finding the Fourth Proportional to 226.50, 312.61 and 139.23

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Solution

The fourth proportional to 226.50, 312.61 and 139.23 is: 192.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    226.50 : 312.61 = 139.23 : x
  2. Step 2: Convert to fraction form
    226.50/312.61 = 139.23/x
  3. Step 3: Cross multiply
    226.50x = 312.61 × 139.23
  4. Step 4: Simplify right side
    226.50x = 43,524.69
  5. Step 5: Solve for x
    x = 43,524.69/226.50
  6. Step 6: Final answer
    x = 192.16

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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.