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Finding the Fourth Proportional to 203.90, 305.79 and 66.93

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Solution

The fourth proportional to 203.90, 305.79 and 66.93 is: 100.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.90 : 305.79 = 66.93 : x
  2. Step 2: Convert to fraction form
    203.90/305.79 = 66.93/x
  3. Step 3: Cross multiply
    203.90x = 305.79 × 66.93
  4. Step 4: Simplify right side
    203.90x = 20,465.22
  5. Step 5: Solve for x
    x = 20,465.22/203.90
  6. Step 6: Final answer
    x = 100.37

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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.