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Finding the Fourth Proportional to 789.48, 1,087.83 and 724.68

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Solution

The fourth proportional to 789.48, 1,087.83 and 724.68 is: 998.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.48 : 1,087.83 = 724.68 : x
  2. Step 2: Convert to fraction form
    789.48/1,087.83 = 724.68/x
  3. Step 3: Cross multiply
    789.48x = 1,087.83 × 724.68
  4. Step 4: Simplify right side
    789.48x = 788,328.64
  5. Step 5: Solve for x
    x = 788,328.64/789.48
  6. Step 6: Final answer
    x = 998.54

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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.