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Finding the Fourth Proportional to 621.45, 857.46 and 355.83

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Solution

The fourth proportional to 621.45, 857.46 and 355.83 is: 490.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.45 : 857.46 = 355.83 : x
  2. Step 2: Convert to fraction form
    621.45/857.46 = 355.83/x
  3. Step 3: Cross multiply
    621.45x = 857.46 × 355.83
  4. Step 4: Simplify right side
    621.45x = 305,109.99
  5. Step 5: Solve for x
    x = 305,109.99/621.45
  6. Step 6: Final answer
    x = 490.96

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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.