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Finding the Fourth Proportional to 801.31, 1,201.96 and 338.80

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Solution

The fourth proportional to 801.31, 1,201.96 and 338.80 is: 508.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.31 : 1,201.96 = 338.80 : x
  2. Step 2: Convert to fraction form
    801.31/1,201.96 = 338.80/x
  3. Step 3: Cross multiply
    801.31x = 1,201.96 × 338.80
  4. Step 4: Simplify right side
    801.31x = 407,219.60
  5. Step 5: Solve for x
    x = 407,219.60/801.31
  6. Step 6: Final answer
    x = 508.20

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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.