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Finding the Fourth Proportional to 686.05, 940.57 and 673.75

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Solution

The fourth proportional to 686.05, 940.57 and 673.75 is: 923.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.05 : 940.57 = 673.75 : x
  2. Step 2: Convert to fraction form
    686.05/940.57 = 673.75/x
  3. Step 3: Cross multiply
    686.05x = 940.57 × 673.75
  4. Step 4: Simplify right side
    686.05x = 633,709.04
  5. Step 5: Solve for x
    x = 633,709.04/686.05
  6. Step 6: Final answer
    x = 923.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.