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Finding the Fourth Proportional to 222.65, 306.97 and 139.72

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Solution

The fourth proportional to 222.65, 306.97 and 139.72 is: 192.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.65 : 306.97 = 139.72 : x
  2. Step 2: Convert to fraction form
    222.65/306.97 = 139.72/x
  3. Step 3: Cross multiply
    222.65x = 306.97 × 139.72
  4. Step 4: Simplify right side
    222.65x = 42,888.73
  5. Step 5: Solve for x
    x = 42,888.73/222.65
  6. Step 6: Final answer
    x = 192.63

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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.