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Finding the Fourth Proportional to 1,481.28, 2,221.89 and 455.28

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Solution

The fourth proportional to 1,481.28, 2,221.89 and 455.28 is: 682.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,481.28 : 2,221.89 = 455.28 : x
  2. Step 2: Convert to fraction form
    1,481.28/2,221.89 = 455.28/x
  3. Step 3: Cross multiply
    1,481.28x = 2,221.89 × 455.28
  4. Step 4: Simplify right side
    1,481.28x = 1,011,582.08
  5. Step 5: Solve for x
    x = 1,011,582.08/1,481.28
  6. Step 6: Final answer
    x = 682.91

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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.