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Finding the Fourth Proportional to 404.38, 609.62 and 391.62

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Solution

The fourth proportional to 404.38, 609.62 and 391.62 is: 590.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    404.38 : 609.62 = 391.62 : x
  2. Step 2: Convert to fraction form
    404.38/609.62 = 391.62/x
  3. Step 3: Cross multiply
    404.38x = 609.62 × 391.62
  4. Step 4: Simplify right side
    404.38x = 238,739.38
  5. Step 5: Solve for x
    x = 238,739.38/404.38
  6. Step 6: Final answer
    x = 590.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.