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Finding the Fourth Proportional to 82.02, 113.08 and 67.21

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Solution

The fourth proportional to 82.02, 113.08 and 67.21 is: 92.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.02 : 113.08 = 67.21 : x
  2. Step 2: Convert to fraction form
    82.02/113.08 = 67.21/x
  3. Step 3: Cross multiply
    82.02x = 113.08 × 67.21
  4. Step 4: Simplify right side
    82.02x = 7,600.78
  5. Step 5: Solve for x
    x = 7,600.78/82.02
  6. Step 6: Final answer
    x = 92.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.