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Finding the Fourth Proportional to 694.49, 1,039.71 and 620.38

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Solution

The fourth proportional to 694.49, 1,039.71 and 620.38 is: 928.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.49 : 1,039.71 = 620.38 : x
  2. Step 2: Convert to fraction form
    694.49/1,039.71 = 620.38/x
  3. Step 3: Cross multiply
    694.49x = 1,039.71 × 620.38
  4. Step 4: Simplify right side
    694.49x = 645,015.29
  5. Step 5: Solve for x
    x = 645,015.29/694.49
  6. Step 6: Final answer
    x = 928.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.