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Finding the Fourth Proportional to 938.89, 1,408.92 and 451.99

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Solution

The fourth proportional to 938.89, 1,408.92 and 451.99 is: 678.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.89 : 1,408.92 = 451.99 : x
  2. Step 2: Convert to fraction form
    938.89/1,408.92 = 451.99/x
  3. Step 3: Cross multiply
    938.89x = 1,408.92 × 451.99
  4. Step 4: Simplify right side
    938.89x = 636,817.75
  5. Step 5: Solve for x
    x = 636,817.75/938.89
  6. Step 6: Final answer
    x = 678.27

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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.