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Finding the Fourth Proportional to 398.12, 596.64 and 205.28

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Solution

The fourth proportional to 398.12, 596.64 and 205.28 is: 307.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.12 : 596.64 = 205.28 : x
  2. Step 2: Convert to fraction form
    398.12/596.64 = 205.28/x
  3. Step 3: Cross multiply
    398.12x = 596.64 × 205.28
  4. Step 4: Simplify right side
    398.12x = 122,478.26
  5. Step 5: Solve for x
    x = 122,478.26/398.12
  6. Step 6: Final answer
    x = 307.64

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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.