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Finding the Fourth Proportional to 71,776.28, 99,055.92 and 39,945.08

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Solution

The fourth proportional to 71,776.28, 99,055.92 and 39,945.08 is: 55,126.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,776.28 : 99,055.92 = 39,945.08 : x
  2. Step 2: Convert to fraction form
    71,776.28/99,055.92 = 39,945.08/x
  3. Step 3: Cross multiply
    71,776.28x = 99,055.92 × 39,945.08
  4. Step 4: Simplify right side
    71,776.28x = 3,956,796,648.87
  5. Step 5: Solve for x
    x = 3,956,796,648.87/71,776.28
  6. Step 6: Final answer
    x = 55,126.80

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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.