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Finding the Fourth Proportional to 203.45, 305.11 and 66.47

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Solution

The fourth proportional to 203.45, 305.11 and 66.47 is: 99.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.45 : 305.11 = 66.47 : x
  2. Step 2: Convert to fraction form
    203.45/305.11 = 66.47/x
  3. Step 3: Cross multiply
    203.45x = 305.11 × 66.47
  4. Step 4: Simplify right side
    203.45x = 20,278.97
  5. Step 5: Solve for x
    x = 20,278.97/203.45
  6. Step 6: Final answer
    x = 99.67

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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.