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Finding the Fourth Proportional to 621.19, 857.32 and 359.21

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Solution

The fourth proportional to 621.19, 857.32 and 359.21 is: 495.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.19 : 857.32 = 359.21 : x
  2. Step 2: Convert to fraction form
    621.19/857.32 = 359.21/x
  3. Step 3: Cross multiply
    621.19x = 857.32 × 359.21
  4. Step 4: Simplify right side
    621.19x = 307,954.08
  5. Step 5: Solve for x
    x = 307,954.08/621.19
  6. Step 6: Final answer
    x = 495.75

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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.