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Finding the Fourth Proportional to 938.94, 1,408.24 and 390.97

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Solution

The fourth proportional to 938.94, 1,408.24 and 390.97 is: 586.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.94 : 1,408.24 = 390.97 : x
  2. Step 2: Convert to fraction form
    938.94/1,408.24 = 390.97/x
  3. Step 3: Cross multiply
    938.94x = 1,408.24 × 390.97
  4. Step 4: Simplify right side
    938.94x = 550,579.59
  5. Step 5: Solve for x
    x = 550,579.59/938.94
  6. Step 6: Final answer
    x = 586.38

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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.