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Finding the Fourth Proportional to 190.66, 285.75 and 103.81

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Solution

The fourth proportional to 190.66, 285.75 and 103.81 is: 155.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.66 : 285.75 = 103.81 : x
  2. Step 2: Convert to fraction form
    190.66/285.75 = 103.81/x
  3. Step 3: Cross multiply
    190.66x = 285.75 × 103.81
  4. Step 4: Simplify right side
    190.66x = 29,662.96
  5. Step 5: Solve for x
    x = 29,662.96/190.66
  6. Step 6: Final answer
    x = 155.58

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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.