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Finding the Fourth Proportional to 621.21, 857.21 and 359.18

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Solution

The fourth proportional to 621.21, 857.21 and 359.18 is: 495.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.21 : 857.21 = 359.18 : x
  2. Step 2: Convert to fraction form
    621.21/857.21 = 359.18/x
  3. Step 3: Cross multiply
    621.21x = 857.21 × 359.18
  4. Step 4: Simplify right side
    621.21x = 307,886.61
  5. Step 5: Solve for x
    x = 307,886.61/621.21
  6. Step 6: Final answer
    x = 495.62

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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.