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Finding the Fourth Proportional to 71,744.64, 99,002 and 39,908.40

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Solution

The fourth proportional to 71,744.64, 99,002 and 39,908.40 is: 55,070.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,744.64 : 99,002 = 39,908.40 : x
  2. Step 2: Convert to fraction form
    71,744.64/99,002 = 39,908.40/x
  3. Step 3: Cross multiply
    71,744.64x = 99,002 × 39,908.40
  4. Step 4: Simplify right side
    71,744.64x = 3,951,011,416.80
  5. Step 5: Solve for x
    x = 3,951,011,416.80/71,744.64
  6. Step 6: Final answer
    x = 55,070.48

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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.