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Finding the Fourth Proportional to 408.08, 611.40 and 202.40

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Solution

The fourth proportional to 408.08, 611.40 and 202.40 is: 303.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.08 : 611.40 = 202.40 : x
  2. Step 2: Convert to fraction form
    408.08/611.40 = 202.40/x
  3. Step 3: Cross multiply
    408.08x = 611.40 × 202.40
  4. Step 4: Simplify right side
    408.08x = 123,747.36
  5. Step 5: Solve for x
    x = 123,747.36/408.08
  6. Step 6: Final answer
    x = 303.24

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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.