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Finding the Fourth Proportional to 684.75, 944.70 and 389.80

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Solution

The fourth proportional to 684.75, 944.70 and 389.80 is: 537.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.75 : 944.70 = 389.80 : x
  2. Step 2: Convert to fraction form
    684.75/944.70 = 389.80/x
  3. Step 3: Cross multiply
    684.75x = 944.70 × 389.80
  4. Step 4: Simplify right side
    684.75x = 368,244.06
  5. Step 5: Solve for x
    x = 368,244.06/684.75
  6. Step 6: Final answer
    x = 537.78

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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.