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Finding the Fourth Proportional to 621.29, 857.38 and 341.55

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Solution

The fourth proportional to 621.29, 857.38 and 341.55 is: 471.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.29 : 857.38 = 341.55 : x
  2. Step 2: Convert to fraction form
    621.29/857.38 = 341.55/x
  3. Step 3: Cross multiply
    621.29x = 857.38 × 341.55
  4. Step 4: Simplify right side
    621.29x = 292,833.85
  5. Step 5: Solve for x
    x = 292,833.85/621.29
  6. Step 6: Final answer
    x = 471.34

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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.