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Finding the Fourth Proportional to 617.61, 852.40 and 396.55

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Solution

The fourth proportional to 617.61, 852.40 and 396.55 is: 547.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.61 : 852.40 = 396.55 : x
  2. Step 2: Convert to fraction form
    617.61/852.40 = 396.55/x
  3. Step 3: Cross multiply
    617.61x = 852.40 × 396.55
  4. Step 4: Simplify right side
    617.61x = 338,019.22
  5. Step 5: Solve for x
    x = 338,019.22/617.61
  6. Step 6: Final answer
    x = 547.30

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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.