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Finding the Fourth Proportional to 919.24, 1,378.43 and 269.84

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Solution

The fourth proportional to 919.24, 1,378.43 and 269.84 is: 404.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.24 : 1,378.43 = 269.84 : x
  2. Step 2: Convert to fraction form
    919.24/1,378.43 = 269.84/x
  3. Step 3: Cross multiply
    919.24x = 1,378.43 × 269.84
  4. Step 4: Simplify right side
    919.24x = 371,958.66
  5. Step 5: Solve for x
    x = 371,958.66/919.24
  6. Step 6: Final answer
    x = 404.64

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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.