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Finding the Fourth Proportional to 621.80, 858.04 and 359.84

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Solution

The fourth proportional to 621.80, 858.04 and 359.84 is: 496.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.80 : 858.04 = 359.84 : x
  2. Step 2: Convert to fraction form
    621.80/858.04 = 359.84/x
  3. Step 3: Cross multiply
    621.80x = 858.04 × 359.84
  4. Step 4: Simplify right side
    621.80x = 308,751.92
  5. Step 5: Solve for x
    x = 308,751.92/621.80
  6. Step 6: Final answer
    x = 496.54

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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.