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Finding the Fourth Proportional to 683.50, 943.15 and 388.77

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Solution

The fourth proportional to 683.50, 943.15 and 388.77 is: 536.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.50 : 943.15 = 388.77 : x
  2. Step 2: Convert to fraction form
    683.50/943.15 = 388.77/x
  3. Step 3: Cross multiply
    683.50x = 943.15 × 388.77
  4. Step 4: Simplify right side
    683.50x = 366,668.43
  5. Step 5: Solve for x
    x = 366,668.43/683.50
  6. Step 6: Final answer
    x = 536.46

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.