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Finding the Fourth Proportional to 143.46, 196.74 and 137.88

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Solution

The fourth proportional to 143.46, 196.74 and 137.88 is: 189.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.46 : 196.74 = 137.88 : x
  2. Step 2: Convert to fraction form
    143.46/196.74 = 137.88/x
  3. Step 3: Cross multiply
    143.46x = 196.74 × 137.88
  4. Step 4: Simplify right side
    143.46x = 27,126.51
  5. Step 5: Solve for x
    x = 27,126.51/143.46
  6. Step 6: Final answer
    x = 189.09

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.