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Finding the Fourth Proportional to 621.32, 857.03 and 385.34

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Solution

The fourth proportional to 621.32, 857.03 and 385.34 is: 531.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.32 : 857.03 = 385.34 : x
  2. Step 2: Convert to fraction form
    621.32/857.03 = 385.34/x
  3. Step 3: Cross multiply
    621.32x = 857.03 × 385.34
  4. Step 4: Simplify right side
    621.32x = 330,241.73
  5. Step 5: Solve for x
    x = 330,241.73/621.32
  6. Step 6: Final answer
    x = 531.52

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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.