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Finding the Fourth Proportional to 689.13, 1,034.21 and 381.25

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Solution

The fourth proportional to 689.13, 1,034.21 and 381.25 is: 572.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.13 : 1,034.21 = 381.25 : x
  2. Step 2: Convert to fraction form
    689.13/1,034.21 = 381.25/x
  3. Step 3: Cross multiply
    689.13x = 1,034.21 × 381.25
  4. Step 4: Simplify right side
    689.13x = 394,285.49
  5. Step 5: Solve for x
    x = 394,285.49/689.13
  6. Step 6: Final answer
    x = 572.15

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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.