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Finding the Fourth Proportional to 919.40, 1,268.35 and 694.93

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Solution

The fourth proportional to 919.40, 1,268.35 and 694.93 is: 958.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.40 : 1,268.35 = 694.93 : x
  2. Step 2: Convert to fraction form
    919.40/1,268.35 = 694.93/x
  3. Step 3: Cross multiply
    919.40x = 1,268.35 × 694.93
  4. Step 4: Simplify right side
    919.40x = 881,414.47
  5. Step 5: Solve for x
    x = 881,414.47/919.40
  6. Step 6: Final answer
    x = 958.68

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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.