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Finding the Fourth Proportional to 99,217.72, 136,921.89 and 53,896.54

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Solution

The fourth proportional to 99,217.72, 136,921.89 and 53,896.54 is: 74,378.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,217.72 : 136,921.89 = 53,896.54 : x
  2. Step 2: Convert to fraction form
    99,217.72/136,921.89 = 53,896.54/x
  3. Step 3: Cross multiply
    99,217.72x = 136,921.89 × 53,896.54
  4. Step 4: Simplify right side
    99,217.72x = 7,379,616,121.26
  5. Step 5: Solve for x
    x = 7,379,616,121.26/99,217.72
  6. Step 6: Final answer
    x = 74,378.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.