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Finding the Fourth Proportional to 203.33, 280.16 and 137.72

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Solution

The fourth proportional to 203.33, 280.16 and 137.72 is: 189.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.33 : 280.16 = 137.72 : x
  2. Step 2: Convert to fraction form
    203.33/280.16 = 137.72/x
  3. Step 3: Cross multiply
    203.33x = 280.16 × 137.72
  4. Step 4: Simplify right side
    203.33x = 38,583.64
  5. Step 5: Solve for x
    x = 38,583.64/203.33
  6. Step 6: Final answer
    x = 189.76

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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.