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Finding the Fourth Proportional to 939.17, 1,408.94 and 391.34

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Solution

The fourth proportional to 939.17, 1,408.94 and 391.34 is: 587.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.17 : 1,408.94 = 391.34 : x
  2. Step 2: Convert to fraction form
    939.17/1,408.94 = 391.34/x
  3. Step 3: Cross multiply
    939.17x = 1,408.94 × 391.34
  4. Step 4: Simplify right side
    939.17x = 551,370.86
  5. Step 5: Solve for x
    x = 551,370.86/939.17
  6. Step 6: Final answer
    x = 587.08

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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.