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Finding the Fourth Proportional to 621.92, 858.31 and 342.20

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Solution

The fourth proportional to 621.92, 858.31 and 342.20 is: 472.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.92 : 858.31 = 342.20 : x
  2. Step 2: Convert to fraction form
    621.92/858.31 = 342.20/x
  3. Step 3: Cross multiply
    621.92x = 858.31 × 342.20
  4. Step 4: Simplify right side
    621.92x = 293,714.97
  5. Step 5: Solve for x
    x = 293,714.97/621.92
  6. Step 6: Final answer
    x = 472.27

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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.