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Finding the Fourth Proportional to 938.52, 1,408.40 and 418.80

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Solution

The fourth proportional to 938.52, 1,408.40 and 418.80 is: 628.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.52 : 1,408.40 = 418.80 : x
  2. Step 2: Convert to fraction form
    938.52/1,408.40 = 418.80/x
  3. Step 3: Cross multiply
    938.52x = 1,408.40 × 418.80
  4. Step 4: Simplify right side
    938.52x = 589,837.92
  5. Step 5: Solve for x
    x = 589,837.92/938.52
  6. Step 6: Final answer
    x = 628.48

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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.