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Finding the Fourth Proportional to 190.75, 286.30 and 99.51

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Solution

The fourth proportional to 190.75, 286.30 and 99.51 is: 149.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.75 : 286.30 = 99.51 : x
  2. Step 2: Convert to fraction form
    190.75/286.30 = 99.51/x
  3. Step 3: Cross multiply
    190.75x = 286.30 × 99.51
  4. Step 4: Simplify right side
    190.75x = 28,489.71
  5. Step 5: Solve for x
    x = 28,489.71/190.75
  6. Step 6: Final answer
    x = 149.36

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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.