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Finding the Fourth Proportional to 938.92, 1,408.92 and 391.36

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Solution

The fourth proportional to 938.92, 1,408.92 and 391.36 is: 587.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.92 : 1,408.92 = 391.36 : x
  2. Step 2: Convert to fraction form
    938.92/1,408.92 = 391.36/x
  3. Step 3: Cross multiply
    938.92x = 1,408.92 × 391.36
  4. Step 4: Simplify right side
    938.92x = 551,394.93
  5. Step 5: Solve for x
    x = 551,394.93/938.92
  6. Step 6: Final answer
    x = 587.27

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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.