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Finding the Fourth Proportional to 621.11, 930.45 and 426.08

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Solution

The fourth proportional to 621.11, 930.45 and 426.08 is: 638.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.11 : 930.45 = 426.08 : x
  2. Step 2: Convert to fraction form
    621.11/930.45 = 426.08/x
  3. Step 3: Cross multiply
    621.11x = 930.45 × 426.08
  4. Step 4: Simplify right side
    621.11x = 396,446.14
  5. Step 5: Solve for x
    x = 396,446.14/621.11
  6. Step 6: Final answer
    x = 638.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.