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Finding the Fourth Proportional to 203.33, 280.50 and 120.40

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Solution

The fourth proportional to 203.33, 280.50 and 120.40 is: 166.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.33 : 280.50 = 120.40 : x
  2. Step 2: Convert to fraction form
    203.33/280.50 = 120.40/x
  3. Step 3: Cross multiply
    203.33x = 280.50 × 120.40
  4. Step 4: Simplify right side
    203.33x = 33,772.20
  5. Step 5: Solve for x
    x = 33,772.20/203.33
  6. Step 6: Final answer
    x = 166.10

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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.