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Finding the Fourth Proportional to 397.78, 596.64 and 109.19

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Solution

The fourth proportional to 397.78, 596.64 and 109.19 is: 163.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.78 : 596.64 = 109.19 : x
  2. Step 2: Convert to fraction form
    397.78/596.64 = 109.19/x
  3. Step 3: Cross multiply
    397.78x = 596.64 × 109.19
  4. Step 4: Simplify right side
    397.78x = 65,146.58
  5. Step 5: Solve for x
    x = 65,146.58/397.78
  6. Step 6: Final answer
    x = 163.78

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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.