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Finding the Fourth Proportional to 190.87, 263.40 and 103.55

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Solution

The fourth proportional to 190.87, 263.40 and 103.55 is: 142.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.87 : 263.40 = 103.55 : x
  2. Step 2: Convert to fraction form
    190.87/263.40 = 103.55/x
  3. Step 3: Cross multiply
    190.87x = 263.40 × 103.55
  4. Step 4: Simplify right side
    190.87x = 27,273.75
  5. Step 5: Solve for x
    x = 27,273.75/190.87
  6. Step 6: Final answer
    x = 142.89

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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.