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Finding the Fourth Proportional to 939.59, 1,408.40 and 451.61

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Solution

The fourth proportional to 939.59, 1,408.40 and 451.61 is: 676.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.59 : 1,408.40 = 451.61 : x
  2. Step 2: Convert to fraction form
    939.59/1,408.40 = 451.61/x
  3. Step 3: Cross multiply
    939.59x = 1,408.40 × 451.61
  4. Step 4: Simplify right side
    939.59x = 636,045.27
  5. Step 5: Solve for x
    x = 636,045.27/939.59
  6. Step 6: Final answer
    x = 676.94

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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.