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Finding the Fourth Proportional to 190.05, 285.21 and 188.43

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Solution

The fourth proportional to 190.05, 285.21 and 188.43 is: 282.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.05 : 285.21 = 188.43 : x
  2. Step 2: Convert to fraction form
    190.05/285.21 = 188.43/x
  3. Step 3: Cross multiply
    190.05x = 285.21 × 188.43
  4. Step 4: Simplify right side
    190.05x = 53,742.12
  5. Step 5: Solve for x
    x = 53,742.12/190.05
  6. Step 6: Final answer
    x = 282.78

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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.