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Finding the Fourth Proportional to 190.84, 286.14 and 105.40

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Solution

The fourth proportional to 190.84, 286.14 and 105.40 is: 158.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.84 : 286.14 = 105.40 : x
  2. Step 2: Convert to fraction form
    190.84/286.14 = 105.40/x
  3. Step 3: Cross multiply
    190.84x = 286.14 × 105.40
  4. Step 4: Simplify right side
    190.84x = 30,159.16
  5. Step 5: Solve for x
    x = 30,159.16/190.84
  6. Step 6: Final answer
    x = 158.03

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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.