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Finding the Fourth Proportional to 621.18, 857.34 and 359.28

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Solution

The fourth proportional to 621.18, 857.34 and 359.28 is: 495.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.18 : 857.34 = 359.28 : x
  2. Step 2: Convert to fraction form
    621.18/857.34 = 359.28/x
  3. Step 3: Cross multiply
    621.18x = 857.34 × 359.28
  4. Step 4: Simplify right side
    621.18x = 308,025.12
  5. Step 5: Solve for x
    x = 308,025.12/621.18
  6. Step 6: Final answer
    x = 495.87

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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.