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Finding the Fourth Proportional to 188.54, 259.56 and 138.68

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Solution

The fourth proportional to 188.54, 259.56 and 138.68 is: 190.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.54 : 259.56 = 138.68 : x
  2. Step 2: Convert to fraction form
    188.54/259.56 = 138.68/x
  3. Step 3: Cross multiply
    188.54x = 259.56 × 138.68
  4. Step 4: Simplify right side
    188.54x = 35,995.78
  5. Step 5: Solve for x
    x = 35,995.78/188.54
  6. Step 6: Final answer
    x = 190.92

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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.