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Finding the Fourth Proportional to 495.90, 684 and 321.30

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Solution

The fourth proportional to 495.90, 684 and 321.30 is: 443.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    495.90 : 684 = 321.30 : x
  2. Step 2: Convert to fraction form
    495.90/684 = 321.30/x
  3. Step 3: Cross multiply
    495.90x = 684 × 321.30
  4. Step 4: Simplify right side
    495.90x = 219,769.20
  5. Step 5: Solve for x
    x = 219,769.20/495.90
  6. Step 6: Final answer
    x = 443.17

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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.