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Finding the Fourth Proportional to 683.92, 943.79 and 389.19

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Solution

The fourth proportional to 683.92, 943.79 and 389.19 is: 537.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.92 : 943.79 = 389.19 : x
  2. Step 2: Convert to fraction form
    683.92/943.79 = 389.19/x
  3. Step 3: Cross multiply
    683.92x = 943.79 × 389.19
  4. Step 4: Simplify right side
    683.92x = 367,314.60
  5. Step 5: Solve for x
    x = 367,314.60/683.92
  6. Step 6: Final answer
    x = 537.07

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Half scale
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Double scale
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Similar ratio
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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.