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Finding the Fourth Proportional to 919.43, 1,268.82 and 499.79

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Solution

The fourth proportional to 919.43, 1,268.82 and 499.79 is: 689.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.43 : 1,268.82 = 499.79 : x
  2. Step 2: Convert to fraction form
    919.43/1,268.82 = 499.79/x
  3. Step 3: Cross multiply
    919.43x = 1,268.82 × 499.79
  4. Step 4: Simplify right side
    919.43x = 634,135.95
  5. Step 5: Solve for x
    x = 634,135.95/919.43
  6. Step 6: Final answer
    x = 689.70

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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.