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Finding the Fourth Proportional to 853.57, 1,177.12 and 789.93

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Solution

The fourth proportional to 853.57, 1,177.12 and 789.93 is: 1,089.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.57 : 1,177.12 = 789.93 : x
  2. Step 2: Convert to fraction form
    853.57/1,177.12 = 789.93/x
  3. Step 3: Cross multiply
    853.57x = 1,177.12 × 789.93
  4. Step 4: Simplify right side
    853.57x = 929,840.43
  5. Step 5: Solve for x
    x = 929,840.43/853.57
  6. Step 6: Final answer
    x = 1,089.36

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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.