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Finding the Fourth Proportional to 137.78, 190.41 and 102.93

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Solution

The fourth proportional to 137.78, 190.41 and 102.93 is: 142.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.78 : 190.41 = 102.93 : x
  2. Step 2: Convert to fraction form
    137.78/190.41 = 102.93/x
  3. Step 3: Cross multiply
    137.78x = 190.41 × 102.93
  4. Step 4: Simplify right side
    137.78x = 19,597.95
  5. Step 5: Solve for x
    x = 19,597.95/137.78
  6. Step 6: Final answer
    x = 142.24

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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.