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Finding the Fourth Proportional to 919.31, 1,268.66 and 505.31

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Solution

The fourth proportional to 919.31, 1,268.66 and 505.31 is: 697.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.31 : 1,268.66 = 505.31 : x
  2. Step 2: Convert to fraction form
    919.31/1,268.66 = 505.31/x
  3. Step 3: Cross multiply
    919.31x = 1,268.66 × 505.31
  4. Step 4: Simplify right side
    919.31x = 641,067.23
  5. Step 5: Solve for x
    x = 641,067.23/919.31
  6. Step 6: Final answer
    x = 697.33

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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.