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Finding the Fourth Proportional to 190.90, 286.48 and 125.76

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Solution

The fourth proportional to 190.90, 286.48 and 125.76 is: 188.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.90 : 286.48 = 125.76 : x
  2. Step 2: Convert to fraction form
    190.90/286.48 = 125.76/x
  3. Step 3: Cross multiply
    190.90x = 286.48 × 125.76
  4. Step 4: Simplify right side
    190.90x = 36,027.72
  5. Step 5: Solve for x
    x = 36,027.72/190.90
  6. Step 6: Final answer
    x = 188.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.