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Finding the Fourth Proportional to 684.70, 944.90 and 389.96

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Solution

The fourth proportional to 684.70, 944.90 and 389.96 is: 538.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.70 : 944.90 = 389.96 : x
  2. Step 2: Convert to fraction form
    684.70/944.90 = 389.96/x
  3. Step 3: Cross multiply
    684.70x = 944.90 × 389.96
  4. Step 4: Simplify right side
    684.70x = 368,473.20
  5. Step 5: Solve for x
    x = 368,473.20/684.70
  6. Step 6: Final answer
    x = 538.15

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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.