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Finding the Fourth Proportional to 1,043.28, 1,439.78 and 684.25

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Solution

The fourth proportional to 1,043.28, 1,439.78 and 684.25 is: 944.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.28 : 1,439.78 = 684.25 : x
  2. Step 2: Convert to fraction form
    1,043.28/1,439.78 = 684.25/x
  3. Step 3: Cross multiply
    1,043.28x = 1,439.78 × 684.25
  4. Step 4: Simplify right side
    1,043.28x = 985,162.44
  5. Step 5: Solve for x
    x = 985,162.44/1,043.28
  6. Step 6: Final answer
    x = 944.29

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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.