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Finding the Fourth Proportional to 269.21, 403.77 and 76.84

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Solution

The fourth proportional to 269.21, 403.77 and 76.84 is: 115.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.21 : 403.77 = 76.84 : x
  2. Step 2: Convert to fraction form
    269.21/403.77 = 76.84/x
  3. Step 3: Cross multiply
    269.21x = 403.77 × 76.84
  4. Step 4: Simplify right side
    269.21x = 31,025.69
  5. Step 5: Solve for x
    x = 31,025.69/269.21
  6. Step 6: Final answer
    x = 115.25

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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.