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Finding the Fourth Proportional to 683.25, 1,018.68 and 641.94

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Solution

The fourth proportional to 683.25, 1,018.68 and 641.94 is: 957.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    683.25 : 1,018.68 = 641.94 : x
  2. Step 2: Convert to fraction form
    683.25/1,018.68 = 641.94/x
  3. Step 3: Cross multiply
    683.25x = 1,018.68 × 641.94
  4. Step 4: Simplify right side
    683.25x = 653,931.44
  5. Step 5: Solve for x
    x = 653,931.44/683.25
  6. Step 6: Final answer
    x = 957.09

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.