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Finding the Fourth Proportional to 190.90, 285.79 and 172.66

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Solution

The fourth proportional to 190.90, 285.79 and 172.66 is: 258.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.90 : 285.79 = 172.66 : x
  2. Step 2: Convert to fraction form
    190.90/285.79 = 172.66/x
  3. Step 3: Cross multiply
    190.90x = 285.79 × 172.66
  4. Step 4: Simplify right side
    190.90x = 49,343.57
  5. Step 5: Solve for x
    x = 49,343.57/190.90
  6. Step 6: Final answer
    x = 258.48

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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.