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Finding the Fourth Proportional to 938.79, 1,408.05 and 289.44

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Solution

The fourth proportional to 938.79, 1,408.05 and 289.44 is: 434.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.79 : 1,408.05 = 289.44 : x
  2. Step 2: Convert to fraction form
    938.79/1,408.05 = 289.44/x
  3. Step 3: Cross multiply
    938.79x = 1,408.05 × 289.44
  4. Step 4: Simplify right side
    938.79x = 407,545.99
  5. Step 5: Solve for x
    x = 407,545.99/938.79
  6. Step 6: Final answer
    x = 434.12

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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.