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Finding the Fourth Proportional to 617.39, 851.79 and 355.34

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Solution

The fourth proportional to 617.39, 851.79 and 355.34 is: 490.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.39 : 851.79 = 355.34 : x
  2. Step 2: Convert to fraction form
    617.39/851.79 = 355.34/x
  3. Step 3: Cross multiply
    617.39x = 851.79 × 355.34
  4. Step 4: Simplify right side
    617.39x = 302,675.06
  5. Step 5: Solve for x
    x = 302,675.06/617.39
  6. Step 6: Final answer
    x = 490.25

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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.