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Finding the Fourth Proportional to 483.10, 664.54 and 393.80

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Solution

The fourth proportional to 483.10, 664.54 and 393.80 is: 541.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.10 : 664.54 = 393.80 : x
  2. Step 2: Convert to fraction form
    483.10/664.54 = 393.80/x
  3. Step 3: Cross multiply
    483.10x = 664.54 × 393.80
  4. Step 4: Simplify right side
    483.10x = 261,695.85
  5. Step 5: Solve for x
    x = 261,695.85/483.10
  6. Step 6: Final answer
    x = 541.70

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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.