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Finding the Fourth Proportional to 617.28, 851.45 and 395.88

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Solution

The fourth proportional to 617.28, 851.45 and 395.88 is: 546.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.28 : 851.45 = 395.88 : x
  2. Step 2: Convert to fraction form
    617.28/851.45 = 395.88/x
  3. Step 3: Cross multiply
    617.28x = 851.45 × 395.88
  4. Step 4: Simplify right side
    617.28x = 337,070.05
  5. Step 5: Solve for x
    x = 337,070.05/617.28
  6. Step 6: Final answer
    x = 546.06

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