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Finding the Fourth Proportional to 617.48, 851.68 and 355.40

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Solution

The fourth proportional to 617.48, 851.68 and 355.40 is: 490.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.48 : 851.68 = 355.40 : x
  2. Step 2: Convert to fraction form
    617.48/851.68 = 355.40/x
  3. Step 3: Cross multiply
    617.48x = 851.68 × 355.40
  4. Step 4: Simplify right side
    617.48x = 302,687.07
  5. Step 5: Solve for x
    x = 302,687.07/617.48
  6. Step 6: Final answer
    x = 490.20

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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.