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Finding the Fourth Proportional to 801.19, 1,201.36 and 411.03

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Solution

The fourth proportional to 801.19, 1,201.36 and 411.03 is: 616.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.19 : 1,201.36 = 411.03 : x
  2. Step 2: Convert to fraction form
    801.19/1,201.36 = 411.03/x
  3. Step 3: Cross multiply
    801.19x = 1,201.36 × 411.03
  4. Step 4: Simplify right side
    801.19x = 493,800.02
  5. Step 5: Solve for x
    x = 493,800.02/801.19
  6. Step 6: Final answer
    x = 616.33

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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.