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Finding the Fourth Proportional to 1,122.44, 1,682.78 and 455.28

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Solution

The fourth proportional to 1,122.44, 1,682.78 and 455.28 is: 682.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.44 : 1,682.78 = 455.28 : x
  2. Step 2: Convert to fraction form
    1,122.44/1,682.78 = 455.28/x
  3. Step 3: Cross multiply
    1,122.44x = 1,682.78 × 455.28
  4. Step 4: Simplify right side
    1,122.44x = 766,136.08
  5. Step 5: Solve for x
    x = 766,136.08/1,122.44
  6. Step 6: Final answer
    x = 682.56

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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.