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Finding the Fourth Proportional to 190.13, 284.78 and 138.86

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Solution

The fourth proportional to 190.13, 284.78 and 138.86 is: 207.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.13 : 284.78 = 138.86 : x
  2. Step 2: Convert to fraction form
    190.13/284.78 = 138.86/x
  3. Step 3: Cross multiply
    190.13x = 284.78 × 138.86
  4. Step 4: Simplify right side
    190.13x = 39,544.54
  5. Step 5: Solve for x
    x = 39,544.54/190.13
  6. Step 6: Final answer
    x = 207.99

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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.