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Finding the Fourth Proportional to 222.21, 306.57 and 139.37

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Solution

The fourth proportional to 222.21, 306.57 and 139.37 is: 192.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.21 : 306.57 = 139.37 : x
  2. Step 2: Convert to fraction form
    222.21/306.57 = 139.37/x
  3. Step 3: Cross multiply
    222.21x = 306.57 × 139.37
  4. Step 4: Simplify right side
    222.21x = 42,726.59
  5. Step 5: Solve for x
    x = 42,726.59/222.21
  6. Step 6: Final answer
    x = 192.28

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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.