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Finding the Fourth Proportional to 621.28, 857.31 and 369.19

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Solution

The fourth proportional to 621.28, 857.31 and 369.19 is: 509.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.28 : 857.31 = 369.19 : x
  2. Step 2: Convert to fraction form
    621.28/857.31 = 369.19/x
  3. Step 3: Cross multiply
    621.28x = 857.31 × 369.19
  4. Step 4: Simplify right side
    621.28x = 316,505.99
  5. Step 5: Solve for x
    x = 316,505.99/621.28
  6. Step 6: Final answer
    x = 509.44

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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.