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Finding the Fourth Proportional to 919.47, 1,379.20 and 226.15

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Solution

The fourth proportional to 919.47, 1,379.20 and 226.15 is: 339.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.47 : 1,379.20 = 226.15 : x
  2. Step 2: Convert to fraction form
    919.47/1,379.20 = 226.15/x
  3. Step 3: Cross multiply
    919.47x = 1,379.20 × 226.15
  4. Step 4: Simplify right side
    919.47x = 311,906.08
  5. Step 5: Solve for x
    x = 311,906.08/919.47
  6. Step 6: Final answer
    x = 339.22

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1.5x scale

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.