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Finding the Fourth Proportional to 801.44, 1,201.78 and 445.01

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Solution

The fourth proportional to 801.44, 1,201.78 and 445.01 is: 667.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.44 : 1,201.78 = 445.01 : x
  2. Step 2: Convert to fraction form
    801.44/1,201.78 = 445.01/x
  3. Step 3: Cross multiply
    801.44x = 1,201.78 × 445.01
  4. Step 4: Simplify right side
    801.44x = 534,806.01
  5. Step 5: Solve for x
    x = 534,806.01/801.44
  6. Step 6: Final answer
    x = 667.31

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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.