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Finding the Fourth Proportional to 683.40, 943.10 and 388.68

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Solution

The fourth proportional to 683.40, 943.10 and 388.68 is: 536.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.40 : 943.10 = 388.68 : x
  2. Step 2: Convert to fraction form
    683.40/943.10 = 388.68/x
  3. Step 3: Cross multiply
    683.40x = 943.10 × 388.68
  4. Step 4: Simplify right side
    683.40x = 366,560.09
  5. Step 5: Solve for x
    x = 366,560.09/683.40
  6. Step 6: Final answer
    x = 536.37

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Double scale
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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.