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Finding the Fourth Proportional to 621.12, 857.09 and 359.13

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Solution

The fourth proportional to 621.12, 857.09 and 359.13 is: 495.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.12 : 857.09 = 359.13 : x
  2. Step 2: Convert to fraction form
    621.12/857.09 = 359.13/x
  3. Step 3: Cross multiply
    621.12x = 857.09 × 359.13
  4. Step 4: Simplify right side
    621.12x = 307,804.94
  5. Step 5: Solve for x
    x = 307,804.94/621.12
  6. Step 6: Final answer
    x = 495.56

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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.