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Finding the Fourth Proportional to 18,128.72, 27,189.99 and 4,978.01

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Solution

The fourth proportional to 18,128.72, 27,189.99 and 4,978.01 is: 7,466.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,128.72 : 27,189.99 = 4,978.01 : x
  2. Step 2: Convert to fraction form
    18,128.72/27,189.99 = 4,978.01/x
  3. Step 3: Cross multiply
    18,128.72x = 27,189.99 × 4,978.01
  4. Step 4: Simplify right side
    18,128.72x = 135,351,906.17
  5. Step 5: Solve for x
    x = 135,351,906.17/18,128.72
  6. Step 6: Final answer
    x = 7,466.16

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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.