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Finding the Fourth Proportional to 196, 270.36 and 137.68

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Solution

The fourth proportional to 196, 270.36 and 137.68 is: 189.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    196 : 270.36 = 137.68 : x
  2. Step 2: Convert to fraction form
    196/270.36 = 137.68/x
  3. Step 3: Cross multiply
    196x = 270.36 × 137.68
  4. Step 4: Simplify right side
    196x = 37,223.16
  5. Step 5: Solve for x
    x = 37,223.16/196
  6. Step 6: Final answer
    x = 189.91

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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.