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Finding the Fourth Proportional to 939.31, 1,408.53 and 391.16

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Solution

The fourth proportional to 939.31, 1,408.53 and 391.16 is: 586.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.31 : 1,408.53 = 391.16 : x
  2. Step 2: Convert to fraction form
    939.31/1,408.53 = 391.16/x
  3. Step 3: Cross multiply
    939.31x = 1,408.53 × 391.16
  4. Step 4: Simplify right side
    939.31x = 550,960.59
  5. Step 5: Solve for x
    x = 550,960.59/939.31
  6. Step 6: Final answer
    x = 586.56

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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.