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Finding the Fourth Proportional to 408.28, 612 and 202.58

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Solution

The fourth proportional to 408.28, 612 and 202.58 is: 303.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.28 : 612 = 202.58 : x
  2. Step 2: Convert to fraction form
    408.28/612 = 202.58/x
  3. Step 3: Cross multiply
    408.28x = 612 × 202.58
  4. Step 4: Simplify right side
    408.28x = 123,978.96
  5. Step 5: Solve for x
    x = 123,978.96/408.28
  6. Step 6: Final answer
    x = 303.66

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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.