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Finding the Fourth Proportional to 919.20, 1,268.16 and 682.56

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Solution

The fourth proportional to 919.20, 1,268.16 and 682.56 is: 941.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.20 : 1,268.16 = 682.56 : x
  2. Step 2: Convert to fraction form
    919.20/1,268.16 = 682.56/x
  3. Step 3: Cross multiply
    919.20x = 1,268.16 × 682.56
  4. Step 4: Simplify right side
    919.20x = 865,595.29
  5. Step 5: Solve for x
    x = 865,595.29/919.20
  6. Step 6: Final answer
    x = 941.68

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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.