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Finding the Fourth Proportional to 190.71, 286.18 and 82.51

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Solution

The fourth proportional to 190.71, 286.18 and 82.51 is: 123.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.71 : 286.18 = 82.51 : x
  2. Step 2: Convert to fraction form
    190.71/286.18 = 82.51/x
  3. Step 3: Cross multiply
    190.71x = 286.18 × 82.51
  4. Step 4: Simplify right side
    190.71x = 23,612.71
  5. Step 5: Solve for x
    x = 23,612.71/190.71
  6. Step 6: Final answer
    x = 123.81

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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.