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Finding the Fourth Proportional to 190.67, 286.15 and 99.39

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Solution

The fourth proportional to 190.67, 286.15 and 99.39 is: 149.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.67 : 286.15 = 99.39 : x
  2. Step 2: Convert to fraction form
    190.67/286.15 = 99.39/x
  3. Step 3: Cross multiply
    190.67x = 286.15 × 99.39
  4. Step 4: Simplify right side
    190.67x = 28,440.20
  5. Step 5: Solve for x
    x = 28,440.20/190.67
  6. Step 6: Final answer
    x = 149.16

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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.