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Finding the Fourth Proportional to 938.98, 1,408.49 and 289.71

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Solution

The fourth proportional to 938.98, 1,408.49 and 289.71 is: 434.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.98 : 1,408.49 = 289.71 : x
  2. Step 2: Convert to fraction form
    938.98/1,408.49 = 289.71/x
  3. Step 3: Cross multiply
    938.98x = 1,408.49 × 289.71
  4. Step 4: Simplify right side
    938.98x = 408,053.64
  5. Step 5: Solve for x
    x = 408,053.64/938.98
  6. Step 6: Final answer
    x = 434.57

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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.