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Finding the Fourth Proportional to 617.60, 851.91 and 396.47

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Solution

The fourth proportional to 617.60, 851.91 and 396.47 is: 546.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.60 : 851.91 = 396.47 : x
  2. Step 2: Convert to fraction form
    617.60/851.91 = 396.47/x
  3. Step 3: Cross multiply
    617.60x = 851.91 × 396.47
  4. Step 4: Simplify right side
    617.60x = 337,752.50
  5. Step 5: Solve for x
    x = 337,752.50/617.60
  6. Step 6: Final answer
    x = 546.88

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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.