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Finding the Fourth Proportional to 919.79, 1,379.88 and 270.48

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Solution

The fourth proportional to 919.79, 1,379.88 and 270.48 is: 405.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.79 : 1,379.88 = 270.48 : x
  2. Step 2: Convert to fraction form
    919.79/1,379.88 = 270.48/x
  3. Step 3: Cross multiply
    919.79x = 1,379.88 × 270.48
  4. Step 4: Simplify right side
    919.79x = 373,229.94
  5. Step 5: Solve for x
    x = 373,229.94/919.79
  6. Step 6: Final answer
    x = 405.78

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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.