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Finding the Fourth Proportional to 617.71, 852.31 and 396.63

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Solution

The fourth proportional to 617.71, 852.31 and 396.63 is: 547.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.71 : 852.31 = 396.63 : x
  2. Step 2: Convert to fraction form
    617.71/852.31 = 396.63/x
  3. Step 3: Cross multiply
    617.71x = 852.31 × 396.63
  4. Step 4: Simplify right side
    617.71x = 338,051.72
  5. Step 5: Solve for x
    x = 338,051.72/617.71
  6. Step 6: Final answer
    x = 547.27

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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.