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Finding the Fourth Proportional to 793.38, 1,188.87 and 638.58

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Solution

The fourth proportional to 793.38, 1,188.87 and 638.58 is: 956.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.38 : 1,188.87 = 638.58 : x
  2. Step 2: Convert to fraction form
    793.38/1,188.87 = 638.58/x
  3. Step 3: Cross multiply
    793.38x = 1,188.87 × 638.58
  4. Step 4: Simplify right side
    793.38x = 759,188.60
  5. Step 5: Solve for x
    x = 759,188.60/793.38
  6. Step 6: Final answer
    x = 956.90

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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.