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Finding the Fourth Proportional to 190.14, 284.94 and 81.87

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Solution

The fourth proportional to 190.14, 284.94 and 81.87 is: 122.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.14 : 284.94 = 81.87 : x
  2. Step 2: Convert to fraction form
    190.14/284.94 = 81.87/x
  3. Step 3: Cross multiply
    190.14x = 284.94 × 81.87
  4. Step 4: Simplify right side
    190.14x = 23,328.04
  5. Step 5: Solve for x
    x = 23,328.04/190.14
  6. Step 6: Final answer
    x = 122.69

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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.