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Finding the Fourth Proportional to 71,990.76, 99,354.15 and 40,162.62

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Solution

The fourth proportional to 71,990.76, 99,354.15 and 40,162.62 is: 55,428.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,990.76 : 99,354.15 = 40,162.62 : x
  2. Step 2: Convert to fraction form
    71,990.76/99,354.15 = 40,162.62/x
  3. Step 3: Cross multiply
    71,990.76x = 99,354.15 × 40,162.62
  4. Step 4: Simplify right side
    71,990.76x = 3,990,322,971.87
  5. Step 5: Solve for x
    x = 3,990,322,971.87/71,990.76
  6. Step 6: Final answer
    x = 55,428.27

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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.