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Finding the Fourth Proportional to 801.17, 1,201.91 and 338.94

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Solution

The fourth proportional to 801.17, 1,201.91 and 338.94 is: 508.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.17 : 1,201.91 = 338.94 : x
  2. Step 2: Convert to fraction form
    801.17/1,201.91 = 338.94/x
  3. Step 3: Cross multiply
    801.17x = 1,201.91 × 338.94
  4. Step 4: Simplify right side
    801.17x = 407,373.68
  5. Step 5: Solve for x
    x = 407,373.68/801.17
  6. Step 6: Final answer
    x = 508.48

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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.