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Finding the Fourth Proportional to 936.10, 1,404.36 and 319.78

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Solution

The fourth proportional to 936.10, 1,404.36 and 319.78 is: 479.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.10 : 1,404.36 = 319.78 : x
  2. Step 2: Convert to fraction form
    936.10/1,404.36 = 319.78/x
  3. Step 3: Cross multiply
    936.10x = 1,404.36 × 319.78
  4. Step 4: Simplify right side
    936.10x = 449,086.24
  5. Step 5: Solve for x
    x = 449,086.24/936.10
  6. Step 6: Final answer
    x = 479.74

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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.