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Finding the Fourth Proportional to 938.85, 1,408.29 and 289.59

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Solution

The fourth proportional to 938.85, 1,408.29 and 289.59 is: 434.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.85 : 1,408.29 = 289.59 : x
  2. Step 2: Convert to fraction form
    938.85/1,408.29 = 289.59/x
  3. Step 3: Cross multiply
    938.85x = 1,408.29 × 289.59
  4. Step 4: Simplify right side
    938.85x = 407,826.70
  5. Step 5: Solve for x
    x = 407,826.70/938.85
  6. Step 6: Final answer
    x = 434.39

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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.