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Finding the Fourth Proportional to 851.16, 1,174.86 and 789.60

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Solution

The fourth proportional to 851.16, 1,174.86 and 789.60 is: 1,089.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.16 : 1,174.86 = 789.60 : x
  2. Step 2: Convert to fraction form
    851.16/1,174.86 = 789.60/x
  3. Step 3: Cross multiply
    851.16x = 1,174.86 × 789.60
  4. Step 4: Simplify right side
    851.16x = 927,669.46
  5. Step 5: Solve for x
    x = 927,669.46/851.16
  6. Step 6: Final answer
    x = 1,089.89

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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.