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Finding the Fourth Proportional to 71,993.80, 107,990.70 and 45,717.40

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Solution

The fourth proportional to 71,993.80, 107,990.70 and 45,717.40 is: 68,576.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,993.80 : 107,990.70 = 45,717.40 : x
  2. Step 2: Convert to fraction form
    71,993.80/107,990.70 = 45,717.40/x
  3. Step 3: Cross multiply
    71,993.80x = 107,990.70 × 45,717.40
  4. Step 4: Simplify right side
    71,993.80x = 4,937,054,028.18
  5. Step 5: Solve for x
    x = 4,937,054,028.18/71,993.80
  6. Step 6: Final answer
    x = 68,576.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.