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Finding the Fourth Proportional to 28,697.72, 43,049.06 and 7,921.22

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Solution

The fourth proportional to 28,697.72, 43,049.06 and 7,921.22 is: 11,882.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,697.72 : 43,049.06 = 7,921.22 : x
  2. Step 2: Convert to fraction form
    28,697.72/43,049.06 = 7,921.22/x
  3. Step 3: Cross multiply
    28,697.72x = 43,049.06 × 7,921.22
  4. Step 4: Simplify right side
    28,697.72x = 341,001,075.05
  5. Step 5: Solve for x
    x = 341,001,075.05/28,697.72
  6. Step 6: Final answer
    x = 11,882.51

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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.