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Finding the Fourth Proportional to 71,800.87, 99,086.94 and 39,971.92

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Solution

The fourth proportional to 71,800.87, 99,086.94 and 39,971.92 is: 55,162.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,800.87 : 99,086.94 = 39,971.92 : x
  2. Step 2: Convert to fraction form
    71,800.87/99,086.94 = 39,971.92/x
  3. Step 3: Cross multiply
    71,800.87x = 99,086.94 × 39,971.92
  4. Step 4: Simplify right side
    71,800.87x = 3,960,694,543.43
  5. Step 5: Solve for x
    x = 3,960,694,543.43/71,800.87
  6. Step 6: Final answer
    x = 55,162.21

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1.5x scale

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.