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Finding the Fourth Proportional to 222.56, 307.09 and 143.90

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Solution

The fourth proportional to 222.56, 307.09 and 143.90 is: 198.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.56 : 307.09 = 143.90 : x
  2. Step 2: Convert to fraction form
    222.56/307.09 = 143.90/x
  3. Step 3: Cross multiply
    222.56x = 307.09 × 143.90
  4. Step 4: Simplify right side
    222.56x = 44,190.25
  5. Step 5: Solve for x
    x = 44,190.25/222.56
  6. Step 6: Final answer
    x = 198.55

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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.