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Finding the Fourth Proportional to 684.53, 944.70 and 389.82

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Solution

The fourth proportional to 684.53, 944.70 and 389.82 is: 537.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.53 : 944.70 = 389.82 : x
  2. Step 2: Convert to fraction form
    684.53/944.70 = 389.82/x
  3. Step 3: Cross multiply
    684.53x = 944.70 × 389.82
  4. Step 4: Simplify right side
    684.53x = 368,260.87
  5. Step 5: Solve for x
    x = 368,260.87/684.53
  6. Step 6: Final answer
    x = 537.98

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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.