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Finding the Fourth Proportional to 51.80, 72.05 and 50.81

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Solution

The fourth proportional to 51.80, 72.05 and 50.81 is: 70.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.80 : 72.05 = 50.81 : x
  2. Step 2: Convert to fraction form
    51.80/72.05 = 50.81/x
  3. Step 3: Cross multiply
    51.80x = 72.05 × 50.81
  4. Step 4: Simplify right side
    51.80x = 3,660.44
  5. Step 5: Solve for x
    x = 3,660.44/51.80
  6. Step 6: Final answer
    x = 70.67

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.