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Finding the Fourth Proportional to 190.86, 286.35 and 138.71

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Solution

The fourth proportional to 190.86, 286.35 and 138.71 is: 208.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.86 : 286.35 = 138.71 : x
  2. Step 2: Convert to fraction form
    190.86/286.35 = 138.71/x
  3. Step 3: Cross multiply
    190.86x = 286.35 × 138.71
  4. Step 4: Simplify right side
    190.86x = 39,718.18
  5. Step 5: Solve for x
    x = 39,718.18/190.86
  6. Step 6: Final answer
    x = 208.10

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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.