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Finding the Fourth Proportional to 455.40, 682.20 and 262.80

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Solution

The fourth proportional to 455.40, 682.20 and 262.80 is: 393.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.40 : 682.20 = 262.80 : x
  2. Step 2: Convert to fraction form
    455.40/682.20 = 262.80/x
  3. Step 3: Cross multiply
    455.40x = 682.20 × 262.80
  4. Step 4: Simplify right side
    455.40x = 179,282.16
  5. Step 5: Solve for x
    x = 179,282.16/455.40
  6. Step 6: Final answer
    x = 393.68

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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.