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Finding the Fourth Proportional to 815.42, 1,125.39 and 789.92

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Solution

The fourth proportional to 815.42, 1,125.39 and 789.92 is: 1,090.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.42 : 1,125.39 = 789.92 : x
  2. Step 2: Convert to fraction form
    815.42/1,125.39 = 789.92/x
  3. Step 3: Cross multiply
    815.42x = 1,125.39 × 789.92
  4. Step 4: Simplify right side
    815.42x = 888,968.07
  5. Step 5: Solve for x
    x = 888,968.07/815.42
  6. Step 6: Final answer
    x = 1,090.20

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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.