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Finding the Fourth Proportional to 793.76, 1,190.10 and 428.18

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Solution

The fourth proportional to 793.76, 1,190.10 and 428.18 is: 641.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    793.76 : 1,190.10 = 428.18 : x
  2. Step 2: Convert to fraction form
    793.76/1,190.10 = 428.18/x
  3. Step 3: Cross multiply
    793.76x = 1,190.10 × 428.18
  4. Step 4: Simplify right side
    793.76x = 509,577.02
  5. Step 5: Solve for x
    x = 509,577.02/793.76
  6. Step 6: Final answer
    x = 641.98

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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.