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Finding the Fourth Proportional to 190.72, 285.42 and 165.36

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Solution

The fourth proportional to 190.72, 285.42 and 165.36 is: 247.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.72 : 285.42 = 165.36 : x
  2. Step 2: Convert to fraction form
    190.72/285.42 = 165.36/x
  3. Step 3: Cross multiply
    190.72x = 285.42 × 165.36
  4. Step 4: Simplify right side
    190.72x = 47,197.05
  5. Step 5: Solve for x
    x = 47,197.05/190.72
  6. Step 6: Final answer
    x = 247.47

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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.