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Finding the Fourth Proportional to 190.72, 286.08 and 53.78

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Solution

The fourth proportional to 190.72, 286.08 and 53.78 is: 80.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    190.72 : 286.08 = 53.78 : x
  2. Step 2: Convert to fraction form
    190.72/286.08 = 53.78/x
  3. Step 3: Cross multiply
    190.72x = 286.08 × 53.78
  4. Step 4: Simplify right side
    190.72x = 15,385.38
  5. Step 5: Solve for x
    x = 15,385.38/190.72
  6. Step 6: Final answer
    x = 80.67

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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.