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Finding the Fourth Proportional to 621.20, 857.16 and 359.24

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Solution

The fourth proportional to 621.20, 857.16 and 359.24 is: 495.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.20 : 857.16 = 359.24 : x
  2. Step 2: Convert to fraction form
    621.20/857.16 = 359.24/x
  3. Step 3: Cross multiply
    621.20x = 857.16 × 359.24
  4. Step 4: Simplify right side
    621.20x = 307,926.16
  5. Step 5: Solve for x
    x = 307,926.16/621.20
  6. Step 6: Final answer
    x = 495.70

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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.