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Finding the Fourth Proportional to 689.25, 1,033.89 and 381.06

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Solution

The fourth proportional to 689.25, 1,033.89 and 381.06 is: 571.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.25 : 1,033.89 = 381.06 : x
  2. Step 2: Convert to fraction form
    689.25/1,033.89 = 381.06/x
  3. Step 3: Cross multiply
    689.25x = 1,033.89 × 381.06
  4. Step 4: Simplify right side
    689.25x = 393,974.12
  5. Step 5: Solve for x
    x = 393,974.12/689.25
  6. Step 6: Final answer
    x = 571.60

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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.