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Finding the Fourth Proportional to 203.09, 280.40 and 133.18

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Solution

The fourth proportional to 203.09, 280.40 and 133.18 is: 183.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.09 : 280.40 = 133.18 : x
  2. Step 2: Convert to fraction form
    203.09/280.40 = 133.18/x
  3. Step 3: Cross multiply
    203.09x = 280.40 × 133.18
  4. Step 4: Simplify right side
    203.09x = 37,343.67
  5. Step 5: Solve for x
    x = 37,343.67/203.09
  6. Step 6: Final answer
    x = 183.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.