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Finding the Fourth Proportional to 686.56, 939.27 and 683.62

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Solution

The fourth proportional to 686.56, 939.27 and 683.62 is: 935.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.56 : 939.27 = 683.62 : x
  2. Step 2: Convert to fraction form
    686.56/939.27 = 683.62/x
  3. Step 3: Cross multiply
    686.56x = 939.27 × 683.62
  4. Step 4: Simplify right side
    686.56x = 642,101.41
  5. Step 5: Solve for x
    x = 642,101.41/686.56
  6. Step 6: Final answer
    x = 935.25

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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.