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Finding the Fourth Proportional to 919.22, 1,268.42 and 520.83

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Solution

The fourth proportional to 919.22, 1,268.42 and 520.83 is: 718.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.22 : 1,268.42 = 520.83 : x
  2. Step 2: Convert to fraction form
    919.22/1,268.42 = 520.83/x
  3. Step 3: Cross multiply
    919.22x = 1,268.42 × 520.83
  4. Step 4: Simplify right side
    919.22x = 660,628.58
  5. Step 5: Solve for x
    x = 660,628.58/919.22
  6. Step 6: Final answer
    x = 718.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.