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Finding the Fourth Proportional to 222.64, 307.21 and 139.73

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Solution

The fourth proportional to 222.64, 307.21 and 139.73 is: 192.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.64 : 307.21 = 139.73 : x
  2. Step 2: Convert to fraction form
    222.64/307.21 = 139.73/x
  3. Step 3: Cross multiply
    222.64x = 307.21 × 139.73
  4. Step 4: Simplify right side
    222.64x = 42,926.45
  5. Step 5: Solve for x
    x = 42,926.45/222.64
  6. Step 6: Final answer
    x = 192.81

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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.