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Finding the Fourth Proportional to 936.38, 1,404.42 and 442.79

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Solution

The fourth proportional to 936.38, 1,404.42 and 442.79 is: 664.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.38 : 1,404.42 = 442.79 : x
  2. Step 2: Convert to fraction form
    936.38/1,404.42 = 442.79/x
  3. Step 3: Cross multiply
    936.38x = 1,404.42 × 442.79
  4. Step 4: Simplify right side
    936.38x = 621,863.13
  5. Step 5: Solve for x
    x = 621,863.13/936.38
  6. Step 6: Final answer
    x = 664.11

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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.