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Finding the Fourth Proportional to 71,808.78, 99,099.59 and 39,977.67

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Solution

The fourth proportional to 71,808.78, 99,099.59 and 39,977.67 is: 55,171.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,808.78 : 99,099.59 = 39,977.67 : x
  2. Step 2: Convert to fraction form
    71,808.78/99,099.59 = 39,977.67/x
  3. Step 3: Cross multiply
    71,808.78x = 99,099.59 × 39,977.67
  4. Step 4: Simplify right side
    71,808.78x = 3,961,770,706.16
  5. Step 5: Solve for x
    x = 3,961,770,706.16/71,808.78
  6. Step 6: Final answer
    x = 55,171.12

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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.