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Finding the Fourth Proportional to 793.84, 1,189.14 and 638.92

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Solution

The fourth proportional to 793.84, 1,189.14 and 638.92 is: 957.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.84 : 1,189.14 = 638.92 : x
  2. Step 2: Convert to fraction form
    793.84/1,189.14 = 638.92/x
  3. Step 3: Cross multiply
    793.84x = 1,189.14 × 638.92
  4. Step 4: Simplify right side
    793.84x = 759,765.33
  5. Step 5: Solve for x
    x = 759,765.33/793.84
  6. Step 6: Final answer
    x = 957.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.