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Finding the Fourth Proportional to 683.57, 943.25 and 388.80

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Solution

The fourth proportional to 683.57, 943.25 and 388.80 is: 536.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.57 : 943.25 = 388.80 : x
  2. Step 2: Convert to fraction form
    683.57/943.25 = 388.80/x
  3. Step 3: Cross multiply
    683.57x = 943.25 × 388.80
  4. Step 4: Simplify right side
    683.57x = 366,733.66
  5. Step 5: Solve for x
    x = 366,733.66/683.57
  6. Step 6: Final answer
    x = 536.50

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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.