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Finding the Fourth Proportional to 683.75, 943.66 and 389.07

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Solution

The fourth proportional to 683.75, 943.66 and 389.07 is: 536.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.75 : 943.66 = 389.07 : x
  2. Step 2: Convert to fraction form
    683.75/943.66 = 389.07/x
  3. Step 3: Cross multiply
    683.75x = 943.66 × 389.07
  4. Step 4: Simplify right side
    683.75x = 367,149.80
  5. Step 5: Solve for x
    x = 367,149.80/683.75
  6. Step 6: Final answer
    x = 536.96

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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.