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Finding the Fourth Proportional to 617.20, 851.74 and 355.24

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Solution

The fourth proportional to 617.20, 851.74 and 355.24 is: 490.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.20 : 851.74 = 355.24 : x
  2. Step 2: Convert to fraction form
    617.20/851.74 = 355.24/x
  3. Step 3: Cross multiply
    617.20x = 851.74 × 355.24
  4. Step 4: Simplify right side
    617.20x = 302,572.12
  5. Step 5: Solve for x
    x = 302,572.12/617.20
  6. Step 6: Final answer
    x = 490.23

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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.