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Finding the Fourth Proportional to 938.63, 1,408.03 and 254.63

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Solution

The fourth proportional to 938.63, 1,408.03 and 254.63 is: 381.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.63 : 1,408.03 = 254.63 : x
  2. Step 2: Convert to fraction form
    938.63/1,408.03 = 254.63/x
  3. Step 3: Cross multiply
    938.63x = 1,408.03 × 254.63
  4. Step 4: Simplify right side
    938.63x = 358,519.00
  5. Step 5: Solve for x
    x = 358,519.00/938.63
  6. Step 6: Final answer
    x = 381.96

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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.