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Finding the Fourth Proportional to 322.56, 482.64 and 279.72

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Solution

The fourth proportional to 322.56, 482.64 and 279.72 is: 418.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.56 : 482.64 = 279.72 : x
  2. Step 2: Convert to fraction form
    322.56/482.64 = 279.72/x
  3. Step 3: Cross multiply
    322.56x = 482.64 × 279.72
  4. Step 4: Simplify right side
    322.56x = 135,004.06
  5. Step 5: Solve for x
    x = 135,004.06/322.56
  6. Step 6: Final answer
    x = 418.54

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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.