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Finding the Fourth Proportional to 203.65, 305.49 and 66.74

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Solution

The fourth proportional to 203.65, 305.49 and 66.74 is: 100.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.65 : 305.49 = 66.74 : x
  2. Step 2: Convert to fraction form
    203.65/305.49 = 66.74/x
  3. Step 3: Cross multiply
    203.65x = 305.49 × 66.74
  4. Step 4: Simplify right side
    203.65x = 20,388.40
  5. Step 5: Solve for x
    x = 20,388.40/203.65
  6. Step 6: Final answer
    x = 100.11

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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.