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Finding the Fourth Proportional to 617.11, 851.61 and 355.13

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Solution

The fourth proportional to 617.11, 851.61 and 355.13 is: 490.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.11 : 851.61 = 355.13 : x
  2. Step 2: Convert to fraction form
    617.11/851.61 = 355.13/x
  3. Step 3: Cross multiply
    617.11x = 851.61 × 355.13
  4. Step 4: Simplify right side
    617.11x = 302,428.00
  5. Step 5: Solve for x
    x = 302,428.00/617.11
  6. Step 6: Final answer
    x = 490.07

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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.