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Finding the Fourth Proportional to 621.69, 857.90 and 359.79

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Solution

The fourth proportional to 621.69, 857.90 and 359.79 is: 496.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.69 : 857.90 = 359.79 : x
  2. Step 2: Convert to fraction form
    621.69/857.90 = 359.79/x
  3. Step 3: Cross multiply
    621.69x = 857.90 × 359.79
  4. Step 4: Simplify right side
    621.69x = 308,664.74
  5. Step 5: Solve for x
    x = 308,664.74/621.69
  6. Step 6: Final answer
    x = 496.49

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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.