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Finding the Fourth Proportional to 18,960.64, 28,445 and 7,273.76

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Solution

The fourth proportional to 18,960.64, 28,445 and 7,273.76 is: 10,912.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,960.64 : 28,445 = 7,273.76 : x
  2. Step 2: Convert to fraction form
    18,960.64/28,445 = 7,273.76/x
  3. Step 3: Cross multiply
    18,960.64x = 28,445 × 7,273.76
  4. Step 4: Simplify right side
    18,960.64x = 206,902,103.20
  5. Step 5: Solve for x
    x = 206,902,103.20/18,960.64
  6. Step 6: Final answer
    x = 10,912.19

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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.