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Finding the Fourth Proportional to 919.25, 1,268.57 and 505.25

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Solution

The fourth proportional to 919.25, 1,268.57 and 505.25 is: 697.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.25 : 1,268.57 = 505.25 : x
  2. Step 2: Convert to fraction form
    919.25/1,268.57 = 505.25/x
  3. Step 3: Cross multiply
    919.25x = 1,268.57 × 505.25
  4. Step 4: Simplify right side
    919.25x = 640,942.47
  5. Step 5: Solve for x
    x = 640,942.47/919.25
  6. Step 6: Final answer
    x = 697.25

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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.