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Finding the Fourth Proportional to 190.50, 285.75 and 82.31

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Solution

The fourth proportional to 190.50, 285.75 and 82.31 is: 123.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.50 : 285.75 = 82.31 : x
  2. Step 2: Convert to fraction form
    190.50/285.75 = 82.31/x
  3. Step 3: Cross multiply
    190.50x = 285.75 × 82.31
  4. Step 4: Simplify right side
    190.50x = 23,518.65
  5. Step 5: Solve for x
    x = 23,518.65/190.50
  6. Step 6: Final answer
    x = 123.46

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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.