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Finding the Fourth Proportional to 621.21, 857.43 and 372.60

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Solution

The fourth proportional to 621.21, 857.43 and 372.60 is: 514.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.21 : 857.43 = 372.60 : x
  2. Step 2: Convert to fraction form
    621.21/857.43 = 372.60/x
  3. Step 3: Cross multiply
    621.21x = 857.43 × 372.60
  4. Step 4: Simplify right side
    621.21x = 319,478.42
  5. Step 5: Solve for x
    x = 319,478.42/621.21
  6. Step 6: Final answer
    x = 514.28

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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.