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Finding the Fourth Proportional to 919.19, 1,268.47 and 499.54

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Solution

The fourth proportional to 919.19, 1,268.47 and 499.54 is: 689.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.19 : 1,268.47 = 499.54 : x
  2. Step 2: Convert to fraction form
    919.19/1,268.47 = 499.54/x
  3. Step 3: Cross multiply
    919.19x = 1,268.47 × 499.54
  4. Step 4: Simplify right side
    919.19x = 633,651.50
  5. Step 5: Solve for x
    x = 633,651.50/919.19
  6. Step 6: Final answer
    x = 689.36

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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.