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Finding the Fourth Proportional to 618.20, 927.30 and 423.80

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Solution

The fourth proportional to 618.20, 927.30 and 423.80 is: 635.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.20 : 927.30 = 423.80 : x
  2. Step 2: Convert to fraction form
    618.20/927.30 = 423.80/x
  3. Step 3: Cross multiply
    618.20x = 927.30 × 423.80
  4. Step 4: Simplify right side
    618.20x = 392,989.74
  5. Step 5: Solve for x
    x = 392,989.74/618.20
  6. Step 6: Final answer
    x = 635.70

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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.