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Finding the Fourth Proportional to 938.74, 1,408.41 and 451.72

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Solution

The fourth proportional to 938.74, 1,408.41 and 451.72 is: 677.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.74 : 1,408.41 = 451.72 : x
  2. Step 2: Convert to fraction form
    938.74/1,408.41 = 451.72/x
  3. Step 3: Cross multiply
    938.74x = 1,408.41 × 451.72
  4. Step 4: Simplify right side
    938.74x = 636,204.71
  5. Step 5: Solve for x
    x = 636,204.71/938.74
  6. Step 6: Final answer
    x = 677.73

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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.