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Finding the Fourth Proportional to 682.25, 1,028.36 and 623.81

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Solution

The fourth proportional to 682.25, 1,028.36 and 623.81 is: 940.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.25 : 1,028.36 = 623.81 : x
  2. Step 2: Convert to fraction form
    682.25/1,028.36 = 623.81/x
  3. Step 3: Cross multiply
    682.25x = 1,028.36 × 623.81
  4. Step 4: Simplify right side
    682.25x = 641,505.38
  5. Step 5: Solve for x
    x = 641,505.38/682.25
  6. Step 6: Final answer
    x = 940.29

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.