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Finding the Fourth Proportional to 684.37, 944.21 and 389.58

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Solution

The fourth proportional to 684.37, 944.21 and 389.58 is: 537.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.37 : 944.21 = 389.58 : x
  2. Step 2: Convert to fraction form
    684.37/944.21 = 389.58/x
  3. Step 3: Cross multiply
    684.37x = 944.21 × 389.58
  4. Step 4: Simplify right side
    684.37x = 367,845.33
  5. Step 5: Solve for x
    x = 367,845.33/684.37
  6. Step 6: Final answer
    x = 537.49

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1.5x scale

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.