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Finding the Fourth Proportional to 190.75, 285.57 and 145.28

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Solution

The fourth proportional to 190.75, 285.57 and 145.28 is: 217.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.75 : 285.57 = 145.28 : x
  2. Step 2: Convert to fraction form
    190.75/285.57 = 145.28/x
  3. Step 3: Cross multiply
    190.75x = 285.57 × 145.28
  4. Step 4: Simplify right side
    190.75x = 41,487.61
  5. Step 5: Solve for x
    x = 41,487.61/190.75
  6. Step 6: Final answer
    x = 217.50

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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.