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Finding the Fourth Proportional to 73,173, 100,979.82 and 39,639

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Solution

The fourth proportional to 73,173, 100,979.82 and 39,639 is: 54,702.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,173 : 100,979.82 = 39,639 : x
  2. Step 2: Convert to fraction form
    73,173/100,979.82 = 39,639/x
  3. Step 3: Cross multiply
    73,173x = 100,979.82 × 39,639
  4. Step 4: Simplify right side
    73,173x = 4,002,739,084.98
  5. Step 5: Solve for x
    x = 4,002,739,084.98/73,173
  6. Step 6: Final answer
    x = 54,702.41

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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.