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Finding the Fourth Proportional to 190.11, 285.24 and 80.45

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Solution

The fourth proportional to 190.11, 285.24 and 80.45 is: 120.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.11 : 285.24 = 80.45 : x
  2. Step 2: Convert to fraction form
    190.11/285.24 = 80.45/x
  3. Step 3: Cross multiply
    190.11x = 285.24 × 80.45
  4. Step 4: Simplify right side
    190.11x = 22,946.13
  5. Step 5: Solve for x
    x = 22,946.13/190.11
  6. Step 6: Final answer
    x = 120.70

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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.