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Finding the Fourth Proportional to 1,043.72, 1,439.82 and 684.60

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Solution

The fourth proportional to 1,043.72, 1,439.82 and 684.60 is: 944.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,043.72 : 1,439.82 = 684.60 : x
  2. Step 2: Convert to fraction form
    1,043.72/1,439.82 = 684.60/x
  3. Step 3: Cross multiply
    1,043.72x = 1,439.82 × 684.60
  4. Step 4: Simplify right side
    1,043.72x = 985,700.77
  5. Step 5: Solve for x
    x = 985,700.77/1,043.72
  6. Step 6: Final answer
    x = 944.41

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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.