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Finding the Fourth Proportional to 203.65, 305.40 and 66.66

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Solution

The fourth proportional to 203.65, 305.40 and 66.66 is: 99.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.65 : 305.40 = 66.66 : x
  2. Step 2: Convert to fraction form
    203.65/305.40 = 66.66/x
  3. Step 3: Cross multiply
    203.65x = 305.40 × 66.66
  4. Step 4: Simplify right side
    203.65x = 20,356.65
  5. Step 5: Solve for x
    x = 20,356.65/203.65
  6. Step 6: Final answer
    x = 99.96

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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.