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Finding the Fourth Proportional to 60,138.72, 90,219.42 and 18,576

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Solution

The fourth proportional to 60,138.72, 90,219.42 and 18,576 is: 27,867.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    60,138.72 : 90,219.42 = 18,576 : x
  2. Step 2: Convert to fraction form
    60,138.72/90,219.42 = 18,576/x
  3. Step 3: Cross multiply
    60,138.72x = 90,219.42 × 18,576
  4. Step 4: Simplify right side
    60,138.72x = 1,675,915,945.92
  5. Step 5: Solve for x
    x = 1,675,915,945.92/60,138.72
  6. Step 6: Final answer
    x = 27,867.50

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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.