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Finding the Fourth Proportional to 322.98, 444.78 and 257.28

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Solution

The fourth proportional to 322.98, 444.78 and 257.28 is: 354.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.98 : 444.78 = 257.28 : x
  2. Step 2: Convert to fraction form
    322.98/444.78 = 257.28/x
  3. Step 3: Cross multiply
    322.98x = 444.78 × 257.28
  4. Step 4: Simplify right side
    322.98x = 114,433.00
  5. Step 5: Solve for x
    x = 114,433.00/322.98
  6. Step 6: Final answer
    x = 354.30

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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.