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Finding the Fourth Proportional to 71,639.92, 98,863 and 39,811.92

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Solution

The fourth proportional to 71,639.92, 98,863 and 39,811.92 is: 54,940.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,639.92 : 98,863 = 39,811.92 : x
  2. Step 2: Convert to fraction form
    71,639.92/98,863 = 39,811.92/x
  3. Step 3: Cross multiply
    71,639.92x = 98,863 × 39,811.92
  4. Step 4: Simplify right side
    71,639.92x = 3,935,925,846.96
  5. Step 5: Solve for x
    x = 3,935,925,846.96/71,639.92
  6. Step 6: Final answer
    x = 54,940.40

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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.