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Finding the Fourth Proportional to 939.92, 1,408.80 and 451.86

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Solution

The fourth proportional to 939.92, 1,408.80 and 451.86 is: 677.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.92 : 1,408.80 = 451.86 : x
  2. Step 2: Convert to fraction form
    939.92/1,408.80 = 451.86/x
  3. Step 3: Cross multiply
    939.92x = 1,408.80 × 451.86
  4. Step 4: Simplify right side
    939.92x = 636,580.37
  5. Step 5: Solve for x
    x = 636,580.37/939.92
  6. Step 6: Final answer
    x = 677.27

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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.