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Finding the Fourth Proportional to 190.33, 285.45 and 87.55

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Solution

The fourth proportional to 190.33, 285.45 and 87.55 is: 131.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.33 : 285.45 = 87.55 : x
  2. Step 2: Convert to fraction form
    190.33/285.45 = 87.55/x
  3. Step 3: Cross multiply
    190.33x = 285.45 × 87.55
  4. Step 4: Simplify right side
    190.33x = 24,991.15
  5. Step 5: Solve for x
    x = 24,991.15/190.33
  6. Step 6: Final answer
    x = 131.30

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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.