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Finding the Fourth Proportional to 617.72, 852.34 and 355.68

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Solution

The fourth proportional to 617.72, 852.34 and 355.68 is: 490.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    617.72 : 852.34 = 355.68 : x
  2. Step 2: Convert to fraction form
    617.72/852.34 = 355.68/x
  3. Step 3: Cross multiply
    617.72x = 852.34 × 355.68
  4. Step 4: Simplify right side
    617.72x = 303,160.07
  5. Step 5: Solve for x
    x = 303,160.07/617.72
  6. Step 6: Final answer
    x = 490.78

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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.