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Finding the Fourth Proportional to 621.34, 857.45 and 355.83

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Solution

The fourth proportional to 621.34, 857.45 and 355.83 is: 491.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.34 : 857.45 = 355.83 : x
  2. Step 2: Convert to fraction form
    621.34/857.45 = 355.83/x
  3. Step 3: Cross multiply
    621.34x = 857.45 × 355.83
  4. Step 4: Simplify right side
    621.34x = 305,105.32
  5. Step 5: Solve for x
    x = 305,105.32/621.34
  6. Step 6: Final answer
    x = 491.04

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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.