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Finding the Fourth Proportional to 1,101.21, 1,518.66 and 851.73

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Solution

The fourth proportional to 1,101.21, 1,518.66 and 851.73 is: 1,174.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,101.21 : 1,518.66 = 851.73 : x
  2. Step 2: Convert to fraction form
    1,101.21/1,518.66 = 851.73/x
  3. Step 3: Cross multiply
    1,101.21x = 1,518.66 × 851.73
  4. Step 4: Simplify right side
    1,101.21x = 1,293,488.28
  5. Step 5: Solve for x
    x = 1,293,488.28/1,101.21
  6. Step 6: Final answer
    x = 1,174.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.