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Finding the Fourth Proportional to 423.15, 634.71 and 130.65

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Solution

The fourth proportional to 423.15, 634.71 and 130.65 is: 195.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.15 : 634.71 = 130.65 : x
  2. Step 2: Convert to fraction form
    423.15/634.71 = 130.65/x
  3. Step 3: Cross multiply
    423.15x = 634.71 × 130.65
  4. Step 4: Simplify right side
    423.15x = 82,924.86
  5. Step 5: Solve for x
    x = 82,924.86/423.15
  6. Step 6: Final answer
    x = 195.97

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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.