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Finding the Fourth Proportional to 18,822.72, 28,223.28 and 7,128.48

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Solution

The fourth proportional to 18,822.72, 28,223.28 and 7,128.48 is: 10,688.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,822.72 : 28,223.28 = 7,128.48 : x
  2. Step 2: Convert to fraction form
    18,822.72/28,223.28 = 7,128.48/x
  3. Step 3: Cross multiply
    18,822.72x = 28,223.28 × 7,128.48
  4. Step 4: Simplify right side
    18,822.72x = 201,189,087.01
  5. Step 5: Solve for x
    x = 201,189,087.01/18,822.72
  6. Step 6: Final answer
    x = 10,688.63

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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.