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Finding the Fourth Proportional to 1,425, 2,138.22 and 938.28

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Solution

The fourth proportional to 1,425, 2,138.22 and 938.28 is: 1,407.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425 : 2,138.22 = 938.28 : x
  2. Step 2: Convert to fraction form
    1,425/2,138.22 = 938.28/x
  3. Step 3: Cross multiply
    1,425x = 2,138.22 × 938.28
  4. Step 4: Simplify right side
    1,425x = 2,006,249.06
  5. Step 5: Solve for x
    x = 2,006,249.06/1,425
  6. Step 6: Final answer
    x = 1,407.89

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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.