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Finding the Fourth Proportional to 190.81, 286.02 and 99.31

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Solution

The fourth proportional to 190.81, 286.02 and 99.31 is: 148.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.81 : 286.02 = 99.31 : x
  2. Step 2: Convert to fraction form
    190.81/286.02 = 99.31/x
  3. Step 3: Cross multiply
    190.81x = 286.02 × 99.31
  4. Step 4: Simplify right side
    190.81x = 28,405.08
  5. Step 5: Solve for x
    x = 28,405.08/190.81
  6. Step 6: Final answer
    x = 148.87

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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.