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Finding the Fourth Proportional to 815.60, 1,229.97 and 804.68

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Solution

The fourth proportional to 815.60, 1,229.97 and 804.68 is: 1,213.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.60 : 1,229.97 = 804.68 : x
  2. Step 2: Convert to fraction form
    815.60/1,229.97 = 804.68/x
  3. Step 3: Cross multiply
    815.60x = 1,229.97 × 804.68
  4. Step 4: Simplify right side
    815.60x = 989,732.26
  5. Step 5: Solve for x
    x = 989,732.26/815.60
  6. Step 6: Final answer
    x = 1,213.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.