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Finding the Fourth Proportional to 621.30, 857.39 and 372.54

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Solution

The fourth proportional to 621.30, 857.39 and 372.54 is: 514.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.30 : 857.39 = 372.54 : x
  2. Step 2: Convert to fraction form
    621.30/857.39 = 372.54/x
  3. Step 3: Cross multiply
    621.30x = 857.39 × 372.54
  4. Step 4: Simplify right side
    621.30x = 319,410.21
  5. Step 5: Solve for x
    x = 319,410.21/621.30
  6. Step 6: Final answer
    x = 514.10

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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.