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Finding the Fourth Proportional to 619.28, 929.34 and 426.56

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Solution

The fourth proportional to 619.28, 929.34 and 426.56 is: 640.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.28 : 929.34 = 426.56 : x
  2. Step 2: Convert to fraction form
    619.28/929.34 = 426.56/x
  3. Step 3: Cross multiply
    619.28x = 929.34 × 426.56
  4. Step 4: Simplify right side
    619.28x = 396,419.27
  5. Step 5: Solve for x
    x = 396,419.27/619.28
  6. Step 6: Final answer
    x = 640.13

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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.