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Finding the Fourth Proportional to 617.90, 852.21 and 396.86

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Solution

The fourth proportional to 617.90, 852.21 and 396.86 is: 547.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.90 : 852.21 = 396.86 : x
  2. Step 2: Convert to fraction form
    617.90/852.21 = 396.86/x
  3. Step 3: Cross multiply
    617.90x = 852.21 × 396.86
  4. Step 4: Simplify right side
    617.90x = 338,210.19
  5. Step 5: Solve for x
    x = 338,210.19/617.90
  6. Step 6: Final answer
    x = 547.36

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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.