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Finding the Fourth Proportional to 206.40, 308.09 and 192.72

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Solution

The fourth proportional to 206.40, 308.09 and 192.72 is: 287.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    206.40 : 308.09 = 192.72 : x
  2. Step 2: Convert to fraction form
    206.40/308.09 = 192.72/x
  3. Step 3: Cross multiply
    206.40x = 308.09 × 192.72
  4. Step 4: Simplify right side
    206.40x = 59,374.14
  5. Step 5: Solve for x
    x = 59,374.14/206.40
  6. Step 6: Final answer
    x = 287.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.