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Finding the Fourth Proportional to 137.47, 190.11 and 121.06

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Solution

The fourth proportional to 137.47, 190.11 and 121.06 is: 167.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.47 : 190.11 = 121.06 : x
  2. Step 2: Convert to fraction form
    137.47/190.11 = 121.06/x
  3. Step 3: Cross multiply
    137.47x = 190.11 × 121.06
  4. Step 4: Simplify right side
    137.47x = 23,014.72
  5. Step 5: Solve for x
    x = 23,014.72/137.47
  6. Step 6: Final answer
    x = 167.42

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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.