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Finding the Fourth Proportional to 684.80, 1,025.18 and 440.60

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Solution

The fourth proportional to 684.80, 1,025.18 and 440.60 is: 659.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.80 : 1,025.18 = 440.60 : x
  2. Step 2: Convert to fraction form
    684.80/1,025.18 = 440.60/x
  3. Step 3: Cross multiply
    684.80x = 1,025.18 × 440.60
  4. Step 4: Simplify right side
    684.80x = 451,694.31
  5. Step 5: Solve for x
    x = 451,694.31/684.80
  6. Step 6: Final answer
    x = 659.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.