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Finding the Fourth Proportional to 203.58, 305.78 and 126.59

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Solution

The fourth proportional to 203.58, 305.78 and 126.59 is: 190.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.58 : 305.78 = 126.59 : x
  2. Step 2: Convert to fraction form
    203.58/305.78 = 126.59/x
  3. Step 3: Cross multiply
    203.58x = 305.78 × 126.59
  4. Step 4: Simplify right side
    203.58x = 38,706.53
  5. Step 5: Solve for x
    x = 38,706.53/203.58
  6. Step 6: Final answer
    x = 190.13

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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.