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Finding the Fourth Proportional to 322.08, 445.04 and 257.12

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Solution

The fourth proportional to 322.08, 445.04 and 257.12 is: 355.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.08 : 445.04 = 257.12 : x
  2. Step 2: Convert to fraction form
    322.08/445.04 = 257.12/x
  3. Step 3: Cross multiply
    322.08x = 445.04 × 257.12
  4. Step 4: Simplify right side
    322.08x = 114,428.68
  5. Step 5: Solve for x
    x = 114,428.68/322.08
  6. Step 6: Final answer
    x = 355.28

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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.