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Finding the Fourth Proportional to 495.56, 683.90 and 321.21

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Solution

The fourth proportional to 495.56, 683.90 and 321.21 is: 443.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.56 : 683.90 = 321.21 : x
  2. Step 2: Convert to fraction form
    495.56/683.90 = 321.21/x
  3. Step 3: Cross multiply
    495.56x = 683.90 × 321.21
  4. Step 4: Simplify right side
    495.56x = 219,675.12
  5. Step 5: Solve for x
    x = 219,675.12/495.56
  6. Step 6: Final answer
    x = 443.28

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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.