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Finding the Fourth Proportional to 617.20, 852.30 and 396.53

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Solution

The fourth proportional to 617.20, 852.30 and 396.53 is: 547.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.20 : 852.30 = 396.53 : x
  2. Step 2: Convert to fraction form
    617.20/852.30 = 396.53/x
  3. Step 3: Cross multiply
    617.20x = 852.30 × 396.53
  4. Step 4: Simplify right side
    617.20x = 337,964.65
  5. Step 5: Solve for x
    x = 337,964.65/617.20
  6. Step 6: Final answer
    x = 547.58

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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.