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Finding the Fourth Proportional to 617.10, 851.21 and 381.12

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Solution

The fourth proportional to 617.10, 851.21 and 381.12 is: 525.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.10 : 851.21 = 381.12 : x
  2. Step 2: Convert to fraction form
    617.10/851.21 = 381.12/x
  3. Step 3: Cross multiply
    617.10x = 851.21 × 381.12
  4. Step 4: Simplify right side
    617.10x = 324,409.49
  5. Step 5: Solve for x
    x = 324,409.49/617.10
  6. Step 6: Final answer
    x = 525.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.