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Finding the Fourth Proportional to 939.43, 1,408.38 and 392.02

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Solution

The fourth proportional to 939.43, 1,408.38 and 392.02 is: 587.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.43 : 1,408.38 = 392.02 : x
  2. Step 2: Convert to fraction form
    939.43/1,408.38 = 392.02/x
  3. Step 3: Cross multiply
    939.43x = 1,408.38 × 392.02
  4. Step 4: Simplify right side
    939.43x = 552,109.61
  5. Step 5: Solve for x
    x = 552,109.61/939.43
  6. Step 6: Final answer
    x = 587.71

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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.