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Finding the Fourth Proportional to 801.33, 1,201.21 and 411.51

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Solution

The fourth proportional to 801.33, 1,201.21 and 411.51 is: 616.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.33 : 1,201.21 = 411.51 : x
  2. Step 2: Convert to fraction form
    801.33/1,201.21 = 411.51/x
  3. Step 3: Cross multiply
    801.33x = 1,201.21 × 411.51
  4. Step 4: Simplify right side
    801.33x = 494,313.40
  5. Step 5: Solve for x
    x = 494,313.40/801.33
  6. Step 6: Final answer
    x = 616.87

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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.