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Finding the Fourth Proportional to 28,481.09, 42,721.65 and 7,421.08

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Solution

The fourth proportional to 28,481.09, 42,721.65 and 7,421.08 is: 11,131.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,481.09 : 42,721.65 = 7,421.08 : x
  2. Step 2: Convert to fraction form
    28,481.09/42,721.65 = 7,421.08/x
  3. Step 3: Cross multiply
    28,481.09x = 42,721.65 × 7,421.08
  4. Step 4: Simplify right side
    28,481.09x = 317,040,782.38
  5. Step 5: Solve for x
    x = 317,040,782.38/28,481.09
  6. Step 6: Final answer
    x = 11,131.62

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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.