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Finding the Fourth Proportional to 793.13, 1,188.61 and 428.09

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Solution

The fourth proportional to 793.13, 1,188.61 and 428.09 is: 641.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.13 : 1,188.61 = 428.09 : x
  2. Step 2: Convert to fraction form
    793.13/1,188.61 = 428.09/x
  3. Step 3: Cross multiply
    793.13x = 1,188.61 × 428.09
  4. Step 4: Simplify right side
    793.13x = 508,825.04
  5. Step 5: Solve for x
    x = 508,825.04/793.13
  6. Step 6: Final answer
    x = 641.54

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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.