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Finding the Fourth Proportional to 683.61, 943.20 and 447.63

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Solution

The fourth proportional to 683.61, 943.20 and 447.63 is: 617.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.61 : 943.20 = 447.63 : x
  2. Step 2: Convert to fraction form
    683.61/943.20 = 447.63/x
  3. Step 3: Cross multiply
    683.61x = 943.20 × 447.63
  4. Step 4: Simplify right side
    683.61x = 422,204.62
  5. Step 5: Solve for x
    x = 422,204.62/683.61
  6. Step 6: Final answer
    x = 617.61

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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.