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Finding the Fourth Proportional to 621.14, 857.52 and 411.35

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Solution

The fourth proportional to 621.14, 857.52 and 411.35 is: 567.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.14 : 857.52 = 411.35 : x
  2. Step 2: Convert to fraction form
    621.14/857.52 = 411.35/x
  3. Step 3: Cross multiply
    621.14x = 857.52 × 411.35
  4. Step 4: Simplify right side
    621.14x = 352,736.56
  5. Step 5: Solve for x
    x = 352,736.56/621.14
  6. Step 6: Final answer
    x = 567.89

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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.