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Finding the Fourth Proportional to 793.44, 1,190.16 and 428.40

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Solution

The fourth proportional to 793.44, 1,190.16 and 428.40 is: 642.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.44 : 1,190.16 = 428.40 : x
  2. Step 2: Convert to fraction form
    793.44/1,190.16 = 428.40/x
  3. Step 3: Cross multiply
    793.44x = 1,190.16 × 428.40
  4. Step 4: Simplify right side
    793.44x = 509,864.54
  5. Step 5: Solve for x
    x = 509,864.54/793.44
  6. Step 6: Final answer
    x = 642.60

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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.