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Finding the Fourth Proportional to 269.20, 403.70 and 115.20

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Solution

The fourth proportional to 269.20, 403.70 and 115.20 is: 172.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.20 : 403.70 = 115.20 : x
  2. Step 2: Convert to fraction form
    269.20/403.70 = 115.20/x
  3. Step 3: Cross multiply
    269.20x = 403.70 × 115.20
  4. Step 4: Simplify right side
    269.20x = 46,504.94
  5. Step 5: Solve for x
    x = 46,504.94/269.20
  6. Step 6: Final answer
    x = 172.75

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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.