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Finding the Fourth Proportional to 423.70, 635.55 and 419.65

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Solution

The fourth proportional to 423.70, 635.55 and 419.65 is: 629.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.70 : 635.55 = 419.65 : x
  2. Step 2: Convert to fraction form
    423.70/635.55 = 419.65/x
  3. Step 3: Cross multiply
    423.70x = 635.55 × 419.65
  4. Step 4: Simplify right side
    423.70x = 266,708.56
  5. Step 5: Solve for x
    x = 266,708.56/423.70
  6. Step 6: Final answer
    x = 629.48

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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.