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Finding the Fourth Proportional to 7,250, 10,005.12 and 3,938

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Solution

The fourth proportional to 7,250, 10,005.12 and 3,938 is: 5,434.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,250 : 10,005.12 = 3,938 : x
  2. Step 2: Convert to fraction form
    7,250/10,005.12 = 3,938/x
  3. Step 3: Cross multiply
    7,250x = 10,005.12 × 3,938
  4. Step 4: Simplify right side
    7,250x = 39,400,162.56
  5. Step 5: Solve for x
    x = 39,400,162.56/7,250
  6. Step 6: Final answer
    x = 5,434.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.