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Finding the Fourth Proportional to 938.97, 1,408.16 and 391.01

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Solution

The fourth proportional to 938.97, 1,408.16 and 391.01 is: 586.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.97 : 1,408.16 = 391.01 : x
  2. Step 2: Convert to fraction form
    938.97/1,408.16 = 391.01/x
  3. Step 3: Cross multiply
    938.97x = 1,408.16 × 391.01
  4. Step 4: Simplify right side
    938.97x = 550,604.64
  5. Step 5: Solve for x
    x = 550,604.64/938.97
  6. Step 6: Final answer
    x = 586.39

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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.