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Finding the Fourth Proportional to 938.96, 1,408.51 and 280.79

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Solution

The fourth proportional to 938.96, 1,408.51 and 280.79 is: 421.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.96 : 1,408.51 = 280.79 : x
  2. Step 2: Convert to fraction form
    938.96/1,408.51 = 280.79/x
  3. Step 3: Cross multiply
    938.96x = 1,408.51 × 280.79
  4. Step 4: Simplify right side
    938.96x = 395,495.52
  5. Step 5: Solve for x
    x = 395,495.52/938.96
  6. Step 6: Final answer
    x = 421.21

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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.