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Finding the Fourth Proportional to 919.24, 1,268.56 and 499.59

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Solution

The fourth proportional to 919.24, 1,268.56 and 499.59 is: 689.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.24 : 1,268.56 = 499.59 : x
  2. Step 2: Convert to fraction form
    919.24/1,268.56 = 499.59/x
  3. Step 3: Cross multiply
    919.24x = 1,268.56 × 499.59
  4. Step 4: Simplify right side
    919.24x = 633,757.70
  5. Step 5: Solve for x
    x = 633,757.70/919.24
  6. Step 6: Final answer
    x = 689.44

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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.