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Finding the Fourth Proportional to 801.81, 1,202.60 and 665.73

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Solution

The fourth proportional to 801.81, 1,202.60 and 665.73 is: 998.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.81 : 1,202.60 = 665.73 : x
  2. Step 2: Convert to fraction form
    801.81/1,202.60 = 665.73/x
  3. Step 3: Cross multiply
    801.81x = 1,202.60 × 665.73
  4. Step 4: Simplify right side
    801.81x = 800,603.57
  5. Step 5: Solve for x
    x = 800,603.57/801.81
  6. Step 6: Final answer
    x = 998.50

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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.