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Finding the Fourth Proportional to 137.90, 190.55 and 103.07

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Solution

The fourth proportional to 137.90, 190.55 and 103.07 is: 142.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.90 : 190.55 = 103.07 : x
  2. Step 2: Convert to fraction form
    137.90/190.55 = 103.07/x
  3. Step 3: Cross multiply
    137.90x = 190.55 × 103.07
  4. Step 4: Simplify right side
    137.90x = 19,639.99
  5. Step 5: Solve for x
    x = 19,639.99/137.90
  6. Step 6: Final answer
    x = 142.42

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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.