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Finding the Fourth Proportional to 801.21, 1,201.94 and 253.21

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Solution

The fourth proportional to 801.21, 1,201.94 and 253.21 is: 379.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.21 : 1,201.94 = 253.21 : x
  2. Step 2: Convert to fraction form
    801.21/1,201.94 = 253.21/x
  3. Step 3: Cross multiply
    801.21x = 1,201.94 × 253.21
  4. Step 4: Simplify right side
    801.21x = 304,341.96
  5. Step 5: Solve for x
    x = 304,341.96/801.21
  6. Step 6: Final answer
    x = 379.85

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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.