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Finding the Fourth Proportional to 203.47, 305.11 and 66.49

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Solution

The fourth proportional to 203.47, 305.11 and 66.49 is: 99.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.47 : 305.11 = 66.49 : x
  2. Step 2: Convert to fraction form
    203.47/305.11 = 66.49/x
  3. Step 3: Cross multiply
    203.47x = 305.11 × 66.49
  4. Step 4: Simplify right side
    203.47x = 20,286.76
  5. Step 5: Solve for x
    x = 20,286.76/203.47
  6. Step 6: Final answer
    x = 99.70

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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.