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Finding the Fourth Proportional to 789.94, 1,087.05 and 785.22

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Solution

The fourth proportional to 789.94, 1,087.05 and 785.22 is: 1,080.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.94 : 1,087.05 = 785.22 : x
  2. Step 2: Convert to fraction form
    789.94/1,087.05 = 785.22/x
  3. Step 3: Cross multiply
    789.94x = 1,087.05 × 785.22
  4. Step 4: Simplify right side
    789.94x = 853,573.40
  5. Step 5: Solve for x
    x = 853,573.40/789.94
  6. Step 6: Final answer
    x = 1,080.55

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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.