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Finding the Fourth Proportional to 1,212.41, 1,816.79 and 902.81

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Solution

The fourth proportional to 1,212.41, 1,816.79 and 902.81 is: 1,352.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.41 : 1,816.79 = 902.81 : x
  2. Step 2: Convert to fraction form
    1,212.41/1,816.79 = 902.81/x
  3. Step 3: Cross multiply
    1,212.41x = 1,816.79 × 902.81
  4. Step 4: Simplify right side
    1,212.41x = 1,640,202.58
  5. Step 5: Solve for x
    x = 1,640,202.58/1,212.41
  6. Step 6: Final answer
    x = 1,352.85

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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.