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Finding the Fourth Proportional to 789.48, 1,089.86 and 767.61

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Solution

The fourth proportional to 789.48, 1,089.86 and 767.61 is: 1,059.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.48 : 1,089.86 = 767.61 : x
  2. Step 2: Convert to fraction form
    789.48/1,089.86 = 767.61/x
  3. Step 3: Cross multiply
    789.48x = 1,089.86 × 767.61
  4. Step 4: Simplify right side
    789.48x = 836,583.60
  5. Step 5: Solve for x
    x = 836,583.60/789.48
  6. Step 6: Final answer
    x = 1,059.66

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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.