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Finding the Fourth Proportional to 683.96, 943.81 and 389.21

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Solution

The fourth proportional to 683.96, 943.81 and 389.21 is: 537.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.96 : 943.81 = 389.21 : x
  2. Step 2: Convert to fraction form
    683.96/943.81 = 389.21/x
  3. Step 3: Cross multiply
    683.96x = 943.81 × 389.21
  4. Step 4: Simplify right side
    683.96x = 367,341.68
  5. Step 5: Solve for x
    x = 367,341.68/683.96
  6. Step 6: Final answer
    x = 537.08

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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.