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Finding the Fourth Proportional to 617.25, 851.72 and 355.22

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Solution

The fourth proportional to 617.25, 851.72 and 355.22 is: 490.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.25 : 851.72 = 355.22 : x
  2. Step 2: Convert to fraction form
    617.25/851.72 = 355.22/x
  3. Step 3: Cross multiply
    617.25x = 851.72 × 355.22
  4. Step 4: Simplify right side
    617.25x = 302,545.14
  5. Step 5: Solve for x
    x = 302,545.14/617.25
  6. Step 6: Final answer
    x = 490.15

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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.