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Finding the Fourth Proportional to 938.86, 1,408.73 and 391.43

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Solution

The fourth proportional to 938.86, 1,408.73 and 391.43 is: 587.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.86 : 1,408.73 = 391.43 : x
  2. Step 2: Convert to fraction form
    938.86/1,408.73 = 391.43/x
  3. Step 3: Cross multiply
    938.86x = 1,408.73 × 391.43
  4. Step 4: Simplify right side
    938.86x = 551,420.75
  5. Step 5: Solve for x
    x = 551,420.75/938.86
  6. Step 6: Final answer
    x = 587.33

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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.